I have been using this option intensively since it came out, and I can say that it is really useful, more than I initially thought.
That is why I dare to make some suggestions that I think could be very useful.
The 30s and 1min options are very similar, you can hardly feel the difference, so I suggest modifying 1min for a 5min one.
I also suggest modifying the timer from 4 weeks to 5 weeks, this is because on several occasions I have needed to keep messages up to 30 days and 4 weeks do not complete the month.
Add an option in this same window of «local deletion», that is, if this is activated, the messages are only deleted on my device, very useful for when you communicate with a MUA, also this is something that has beenasked multiple times