diff --git a/modules/usage.ts b/modules/usage.ts
index 1fd5e99..50fe4c2 100644
--- a/modules/usage.ts
+++ b/modules/usage.ts
@@ -14,7 +14,7 @@ function duration(valueMs: number | undefined): string | undefined {
   const ms = Math.max(0, valueMs);
   const days = Math.floor(ms / 86_400_000);
   const hours = Math.floor((ms % 86_400_000) / 3_600_000);
-  const minutes = Math.round((ms % 3_600_000) / 60_000);
+  const minutes = Math.floor((ms % 3_600_000) / 60_000);
   if (days > 0) return `${days}d${hours}h`;
   if (hours > 0) return `${hours}h${minutes}m`;
   return `${minutes}m`;