Function crash

I have a function that iterate over all users to get their emails, I'm calling this function with a pagination of 600 users (I tried lowering it to 100/200, it didn't fix anything).
The function seems to work fine at the begining but a one moment, it just stops working and timeout (in the screenshot, it crashed at 16200 users)

It's like the function executor get overloaded but the function calls and just stops working (I'm on Appwrite cloud Pro tier)

Does the function needs more than 30 seconds to run?

What's the error you're getting?

The function need ~10 seconds for every run but sudently it spikes at 30 seconds and times out

on the last call:

Are you always returning a result with this?
return res.send();