You are missing the point.
Checking to renew is very little effort.
It usually just looks at the cert and looks at the clock and says "I have nothing to do now".
The time window for it to actually to try and renew is from day 60 to day 90 [30 days].
If you only check once a week, that's only five attempts to check for renewals [at best].
If you check twice a day [as recommended by LE and done by every ACME client as default], it would have sixty attempts to check for renewals.
Choose wisely: 5 or 60