Scheduled task for reboot

i want to set scheduled task for reboot 3 routers with openwrt, first is wr841hpv3 second wr941v5.1 and third wa901v4 for first i would set every 30 days for second every 20 days and third every 30 days what ic crone cod can you tell me for 20 ? and for 30 days?

https://openwrt.org/docs/guide-user/base-system/cron#periodic_reboot

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can you tell me more specific please

That page is specific. It explains how to use cron and what the syntax is.

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That page gives pretty detailed idea from OpenWrt perspective, and for generic cron advice regarding the crontab file format you can read e.g.
https://linux.die.net/man/5/crontab

Or search the internet for crontab advice.

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