I m gonna be away from my tent for 4 days, need advice on watering the plant, how you guys do it. And what would happen if no watering at all during.

FYI: I already have light and ventilation operate automatically.

Hello,
Some people put the pot inside a basin with water, so until the water evaporates completelly, it keeps the roots wet for a few days more, I never tried this afraid to drown it, I always ask someone to water them for me, but it already gonne wrong like that, so Idk which is riskier... xD
Never tried to grow a tree indoors either, but in most cases, when they appear here on the forum, they are about to die...

Two choices. One is spend money on an automatic water system. I tried that and once the timer broke. Anotjer time my helpful neighbor saw the water running and helped me out by turning the water off.

The last 8 years or so I have been paying a local kid $5.00 a day. In that time I have lost one tree. The problem is finding a dependable kid.

what exacty do you mean with your tent?
What plants are you growing, and where is it and where are you?