Can the plant survive for 2,5 days without watering?

Good suggestion on wick watering. or even old pop bottle with holes in them and a watering spike attached to it. Should be fine though. would not worry to much about it. You would know best if it would drink it all up in that time. Best to water when it needs it vs on a schedule this way its allowing a bit of a dry back and easeing root rot issues.

Search for wick watering. You can rig something to give it some water while you gone.

well... i give 1L very two days 😅 i guess my plants could survive over a week without water but that would sure hurt them

if it doesn't dry out in 3 days, sure. just need a big enough pot.

In soil easily 3 days, only if you have a giant plant in a small pot i wouldn’t recommend. Drought stress is actually even beneficial during week 1-3 of flowering and later at the ripening stage you want to have more dryback than in Veg and Bulk. Even if they are hanging a bit looking droopy when you return, give your normal amount of water and they will recover, get back up in a short time. You can give her a bit more than usual before you leave, but don’t give her more than usual when you come back

I grow in biobizz light mix and its usually 3 days between waterings. Just make sure you completely saturate the soil before you go away, if you get plenty of runoff then it's soaked.