gREEn7o0answered grow question 2 years ago If you are in veg and they don't need daily water you should be just fine. I have left plants for 3 or 4 days before, just gave a heavy water before I left and left the tent to do its thing. Got back from visiting family and gave them a nice feeding and water on their 4th day.
If you are in small pots and need daily water I would think about transplanting to next size up, would buy you a few days while they recover and spread roots.