How long can you leave an Aquafarm unattended?

I would've asked this in my other thread, but I'm having problems with my posting

I was wondering, how long can you leave an Aquafarm unattended? I am planning on going to poland for 5 days and was wondering whether I can leave it alone for this length of time? Is the res big enough (35L) to allow for this? Or do I need to hook it up to a bigger res with a float valve?

Whenever I go on vacation I fill up a secondary reservoir with straight PH'd RO
water and set it up to a float valve to ensure consistent nutrient levels. I could
probably get away without, but the piece of mind in knowing that my PPMs will not
shoot up high and burn my plants, and my nutrient levels will not get dangerously
low and burn out my pumps is really worth the minimal cost secondary reservoir.

The PH is kinda out of control without a doser but generally speaking wont fluctuate
to much if your system is in a good balance.

I've never used an aquafarm, but I would imagine the necessity of having a reservoir for
your vacation would really depend on how much your plants are drinking, as well as how
much of the PPMs they're consuming vs. the amount of water intake. You don't want your
PPMs to shoot up really high while you're gone cuz they're drinking too much water and
not enough food, so I'd try to get this as balanced as possible.