Telegram ads approval taking longer than expected

I'm curious about one thing. Does Telegram review ads on weekends too, or do most approvals happen during weekdays? If someone submits an ad on Friday,
could it stay pending until Monday?

Well that's pretty normal for telegram

It can happen, especially depending on the niche and landing page, Telegram may review the destination website and ad content, not just the creative itself.

Check that everything follows their ad policies, and if it's been stuck for several days, contact support rather than repeatedly submitting the same ad.

this is a standard procedure, items submitted for review will be approved after some time. moving forward, you should be mindful of a few things when launching ad campaigns. by analyzing what others in your niche are doing, you can set up your campaigns more effectively, which should help ensure they get approved quickly.