diff --git a/CHANGELOG.md b/CHANGELOG.md
index b679547..27d193b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,7 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 - Cloudflare Workers `scheduled` handler that POSTs to the Claude Code routine `/fire` endpoint.
-- Default 20×daily cron at UTC+7 — 00:00 once, then hourly 05-09 / 10-14 / 15-19 / 20-23 with stepped minute offsets (:01-:04). Packed into 5 cron expressions to fit the CF free-tier limit.
+- Default 20×daily cron at UTC+7 — fires at 00:00 and hourly from 05:00 through 23:00. Single cron expression (`0 0-17,22-23 * * *`).
 - Token-substitution template with `{ISO}`, `{LocalTime}`, `{Cron}` (default: `Scheduled trigger at {LocalTime}`).
 - IANA timezone support via `TZ` env var (default: `UTC`).
 - Structured JSON logs for fire success / non-2xx / network failure.
diff --git a/README.md b/README.md
index cff813a..11c582f 100644
--- a/README.md
+++ b/README.md
@@ -60,11 +60,7 @@ Edit `wrangler.toml` `[triggers].crons` — Cloudflare requires literal cron exp
 ```toml
 [triggers]
 crons = [
-  "0 17 * * *",          # 00:00 UTC+7  (17:00 UTC prev day)
-  "1 22,23,0,1,2 * * *", # 05:01-09:01 UTC+7
-  "2 3-7 * * *",         # 10:02-14:02 UTC+7
-  "3 8-12 * * *",        # 15:03-19:03 UTC+7
-  "4 13-16 * * *",       # 20:04-23:04 UTC+7
+  "0 0-17,22-23 * * *", # UTC+7: 00:00 + 05:00..23:00 hourly
 ]
 ```
 
@@ -73,8 +69,8 @@ Then redeploy: `npx wrangler deploy`.
 Tips:
 - Cron runs in **UTC**. Convert your local time: `UTC = local − offset` (e.g. 09:00 UTC+7 → 02:00 UTC → `0 2 * * *`).
 - Validate expressions at <https://crontab.guru/>.
-- **Free tier limit:** 5 cron expressions per worker. Default config uses all 5. Use comma lists (`1 22,23,0,1,2 * * *`) and ranges (`2 3-7 * * *`) to fit more fires per row.
-- Standard 5-field syntax — supports `*`, `,`, `-`, `/`. Use minute offsets (`:01`, `:02`, …) instead of `:00` to avoid top-of-hour contention on shared infra.
+- **Free tier limit:** 5 cron expressions per worker. Default config uses 1.
+- Standard 5-field syntax — supports `*`, `,`, `-`, `/`. Comma lists (`22,23,0,1,2`) and ranges (`3-7`) let you cram many fires into one expression.
 
 ## Templates
 
diff --git a/wrangler.toml b/wrangler.toml
index 2e7acc1..96325e5 100644
--- a/wrangler.toml
+++ b/wrangler.toml
@@ -11,22 +11,12 @@ TZ = "Asia/Ho_Chi_Minh"
 
 # Cron triggers fire from this list. CF Workers requires literal cron
 # expressions here — they cannot be loaded from env vars or secrets.
-# Schedule (Asia/Ho_Chi_Minh, UTC+7) — 20 fires/day, packed into 5 expressions:
-#   00:00         — once at local midnight
-#   05:01-09:01   — every hour, minute 01
-#   10:02-14:02   — every hour, minute 02
-#   15:03-19:03   — every hour, minute 03
-#   20:04-23:04   — every hour, minute 04
-# Crons evaluate in UTC, so each row is offset by -7 hours; the 05-09 row
-# wraps midnight UTC so it uses a comma list rather than a range.
-# Free tier allows up to 5 cron expressions per worker — at limit.
+# Schedule (Asia/Ho_Chi_Minh, UTC+7): hourly at :00 from 05:00 to 23:00,
+# plus a single fire at 00:00 — 20 fires/day, every hour except 01-04.
+# Crons evaluate in UTC; UTC+7 hours {00, 05..23} map to UTC {17, 22-23, 0-16}.
 [triggers]
 crons = [
-  "0 17 * * *",          # 00:00 UTC+7  (17:00 UTC prev day)
-  "1 22,23,0,1,2 * * *", # 05:01-09:01 UTC+7
-  "2 3-7 * * *",         # 10:02-14:02 UTC+7
-  "3 8-12 * * *",        # 15:03-19:03 UTC+7
-  "4 13-16 * * *",       # 20:04-23:04 UTC+7
+  "0 0-17,22-23 * * *", # UTC+7: 00:00 + 05:00..23:00 hourly
 ]
 
 # Built-in observability (free tier supports basic logs).