While protected from normal rain it would be still exposed to all temperature changes along with humidity.
Also rain doesn't always come vertically...
(sometimes it's more like horizontally)
So weather sealing would definitely be in good to have list.
Olympus doesn't have much compacts anymore, though not that any maker has much of them.
And not sure how good time lapse function compacts they have.
Though Olympus seems to be one of those who include most of software based features throughout line up.
I just checked and in E-M1 MkII highest number of taken shots for one run is 999.
Both waiting time from shutter press to first frame and interval between frames can be set up to 24h
Also AC adapter would be pretty much needed to avoid frequent battery swaps.
While cameras are able to go to sleep mode between shots it would be simply better to have AC power for minimizing amount of manual work.
Actually not that many cameras might have AC adapter as accessory.
Some makers seems to be really liberal about use of term "weather resistant" when there's clear holes in sealing...
https://www.lensrentals.com/blog/20...ur-camera-wet-teardown-of-a-salty-sony-a7sii/