Setting an hourly monitor

Hello community,

I’ve set my first hourly monitor that runs a request to publish a tweet via Twitter API every hour. It needs to run after two cronjobs run on my website so that the pre-request can fetch the proper content to publish in the tweet.

I couldn’t find a way to set the initial time, but I manually ran the monitor at 9:15 and expected that it would run again by itself at 10:15, but instead it ran only 48 minutes later, at 10:03. Is there a way to set a precise time when it runs?

If not, is there a known margin (+/- so many minutes) that I should consider?