diff --git a/src/time/blockTimer.test.ts b/src/time/blockTimer.test.ts
new file mode 100644
index 00000000..77946144
--- /dev/null
+++ b/src/time/blockTimer.test.ts
@@ -0,0 +1,5 @@
+import { _blockTimer } from './time.util'
+
+test('_blockTimer', () => {
+  using _timer = _blockTimer()
+})
diff --git a/src/time/time.util.test.ts b/src/time/time.util.test.ts
index a8f82af0..814fb38d 100644
--- a/src/time/time.util.test.ts
+++ b/src/time/time.util.test.ts
@@ -1,5 +1,5 @@
 import { mockTime } from '@naturalcycles/dev-lib/dist/testing'
-import { _blockTimer, _range } from '..'
+import { _range } from '..'
 import { _ms, _since } from './time.util'
 
 beforeEach(() => {
@@ -14,6 +14,9 @@ test('since', () => {
 test('ms', () => {
   expect(_ms(1)).toBe('1 ms')
   expect(_ms(10)).toBe('10 ms')
+  expect(_ms(999)).toBe('999 ms')
+  expect(_ms(1000)).toBe('1 sec')
+  expect(_ms(1001)).toBe('1.001 sec')
   expect(_ms(1005)).toBe('1.005 sec')
   expect(_ms(49123)).toBe('49 sec')
   expect(_ms(59123)).toBe('59 sec')
@@ -34,13 +37,214 @@ test('ms', () => {
 })
 
 test('log progression', () => {
-  let m = 1000
+  const map = new Map<number, string>()
+  let m = 700
   _range(1, 200).forEach(() => {
-    console.log(m, _ms(m))
+    // console.log(m, _ms(m))
+    map.set(m, _ms(m))
     m = Math.round(m * 1.1)
   })
-})
-
-test('_blockTimer', () => {
-  using _timer = _blockTimer()
+  expect(map).toMatchInlineSnapshot(`
+Map {
+  700 => "700 ms",
+  770 => "770 ms",
+  847 => "847 ms",
+  932 => "932 ms",
+  1025 => "1.025 sec",
+  1128 => "1.128 sec",
+  1241 => "1.241 sec",
+  1365 => "1.365 sec",
+  1502 => "1.502 sec",
+  1652 => "1.652 sec",
+  1817 => "1.817 sec",
+  1999 => "1.999 sec",
+  2199 => "2.199 sec",
+  2419 => "2.419 sec",
+  2661 => "2.661 sec",
+  2927 => "2.927 sec",
+  3220 => "3.220 sec",
+  3542 => "3.542 sec",
+  3896 => "3.896 sec",
+  4286 => "4.286 sec",
+  4715 => "4.715 sec",
+  5187 => "5 sec",
+  5706 => "5 sec",
+  6277 => "6 sec",
+  6905 => "6 sec",
+  7596 => "7 sec",
+  8356 => "8 sec",
+  9192 => "9 sec",
+  10111 => "10 sec",
+  11122 => "11 sec",
+  12234 => "12 sec",
+  13457 => "13 sec",
+  14803 => "14 sec",
+  16283 => "16 sec",
+  17911 => "17 sec",
+  19702 => "19 sec",
+  21672 => "21 sec",
+  23839 => "23 sec",
+  26223 => "26 sec",
+  28845 => "28 sec",
+  31730 => "31 sec",
+  34903 => "34 sec",
+  38393 => "38 sec",
+  42232 => "42 sec",
+  46455 => "46 sec",
+  51101 => "51 sec",
+  56211 => "56 sec",
+  61832 => "1m1s",
+  68015 => "1m8s",
+  74817 => "1m14s",
+  82299 => "1m22s",
+  90529 => "1m30s",
+  99582 => "1m39s",
+  109540 => "1m49s",
+  120494 => "2m0s",
+  132543 => "2m12s",
+  145797 => "2m25s",
+  160377 => "2m40s",
+  176415 => "2m56s",
+  194057 => "3m14s",
+  213463 => "3m33s",
+  234809 => "3m54s",
+  258290 => "4m18s",
+  284119 => "4m44s",
+  312531 => "5m12s",
+  343784 => "5m43s",
+  378162 => "6m18s",
+  415978 => "6m55s",
+  457576 => "7m37s",
+  503334 => "8m23s",
+  553667 => "9m13s",
+  609034 => "10m9s",
+  669937 => "11m9s",
+  736931 => "12m16s",
+  810624 => "13m30s",
+  891686 => "14m51s",
+  980855 => "16m20s",
+  1078941 => "17m58s",
+  1186835 => "19m46s",
+  1305519 => "21m45s",
+  1436071 => "23m56s",
+  1579678 => "26m19s",
+  1737646 => "28m57s",
+  1911411 => "31m51s",
+  2102552 => "35m2s",
+  2312807 => "38m32s",
+  2544088 => "42m24s",
+  2798497 => "46m38s",
+  3078347 => "51m18s",
+  3386182 => "56m26s",
+  3724800 => "1h2m",
+  4097280 => "1h8m",
+  4507008 => "1h15m",
+  4957709 => "1h22m",
+  5453480 => "1h30m",
+  5998828 => "1h39m",
+  6598711 => "1h49m",
+  7258582 => "2h0m",
+  7984440 => "2h13m",
+  8782884 => "2h26m",
+  9661172 => "2h41m",
+  10627289 => "2h57m",
+  11690018 => "3h14m",
+  12859020 => "3h34m",
+  14144922 => "3h55m",
+  15559414 => "4h19m",
+  17115355 => "4h45m",
+  18826891 => "5h13m",
+  20709580 => "5h45m",
+  22780538 => "6h19m",
+  25058592 => "6h57m",
+  27564451 => "7h39m",
+  30320896 => "8h25m",
+  33352986 => "9h15m",
+  36688285 => "10h11m",
+  40357114 => "11h12m",
+  44392825 => "12h19m",
+  48832108 => "13h33m",
+  53715319 => "14h55m",
+  59086851 => "16h24m",
+  64995536 => "18h3m",
+  71495090 => "19h51m",
+  78644599 => "21h50m",
+  86509059 => "24h",
+  95159965 => "26h",
+  104675962 => "29h",
+  115143558 => "32h",
+  126657914 => "35h",
+  139323705 => "39h",
+  153256076 => "43h",
+  168581684 => "47h",
+  185439852 => "2 days",
+  203983837 => "2 days",
+  224382221 => "2 days",
+  246820443 => "2 days",
+  271502487 => "3 days",
+  298652736 => "3 days",
+  328518010 => "3 days",
+  361369811 => "4 days",
+  397506792 => "4 days",
+  437257471 => "5 days",
+  480983218 => "5 days",
+  529081540 => "6 days",
+  581989694 => "6 days",
+  640188663 => "7 days",
+  704207529 => "8 days",
+  774628282 => "8 days",
+  852091110 => "9 days",
+  937300221 => "10 days",
+  1031030243 => "11 days",
+  1134133267 => "13 days",
+  1247546594 => "14 days",
+  1372301253 => "15 days",
+  1509531378 => "17 days",
+  1660484516 => "19 days",
+  1826532968 => "21 days",
+  2009186265 => "23 days",
+  2210104892 => "25 days",
+  2431115381 => "28 days",
+  2674226919 => "30 days",
+  2941649611 => "34 days",
+  3235814572 => "37 days",
+  3559396029 => "41 days",
+  3915335632 => "45 days",
+  4306869195 => "49 days",
+  4737556115 => "54 days",
+  5211311727 => "60 days",
+  5732442900 => "66 days",
+  6305687190 => "72 days",
+  6936255909 => "80 days",
+  7629881500 => "88 days",
+  8392869650 => "97 days",
+  9232156615 => "106 days",
+  10155372277 => "117 days",
+  11170909505 => "129 days",
+  12288000456 => "142 days",
+  13516800502 => "156 days",
+  14868480552 => "172 days",
+  16355328607 => "189 days",
+  17990861468 => "208 days",
+  19789947615 => "229 days",
+  21768942377 => "251 days",
+  23945836615 => "277 days",
+  26340420277 => "304 days",
+  28974462305 => "335 days",
+  31871908536 => "368 days",
+  35059099390 => "405 days",
+  38565009329 => "446 days",
+  42421510262 => "490 days",
+  46663661288 => "540 days",
+  51330027417 => "594 days",
+  56463030159 => "653 days",
+  62109333175 => "718 days",
+  68320266493 => "790 days",
+  75152293142 => "869 days",
+  82667522456 => "956 days",
+  90934274702 => "1052 days",
+  100027702172 => "1157 days",
+  110030472389 => "1273 days",
+}
+`)
 })
diff --git a/src/time/time.util.ts b/src/time/time.util.ts
index 4e4477b2..14c49871 100644
--- a/src/time/time.util.ts
+++ b/src/time/time.util.ts
@@ -37,7 +37,10 @@ export function _ms(millis: number): string {
   if (millis < 1000) return `${Math.round(millis)} ms`
 
   // < 5 sec
-  if (millis < 5000) return `${(millis / 1000).toFixed(3)} sec`
+  if (millis < 5000) {
+    const s = millis / 1000
+    return `${Math.trunc(s) === s ? s : s.toFixed(3)} sec`
+  }
 
   const sec = Math.floor(millis / 1000) % 60
   const min = Math.floor(millis / (60 * 1000)) % 60