How long will my plants last?

Here's the situation:

I'm leaving for Vegas Friday afternoon, won't be back until Sunday afternoon. If my pH is perfect (maybe even slightly too acidic) on Friday, will my baby (1 plant, 3 weeks old, 4L resevoir) make it?

Please also be clear if you are speculating or if you actually have experience leaving your hydro system for more than one day.

Just to be clear, I'm mainly concerned with pH getting out of control by Sunday. I know for a fact the plant will not run out of water (or even come close).

As long as there is enough water it will be fine, I've left a system for 2
weeks while I went across the world and came back and they were
actually better than I had anticipated. The PH wasn't that far off and
I had put them in my system 4 days before I left. You should be fine
for just a few days I wouldn't worry.

I was gone for a week at Christmas, no issues.

Drain the nutrient water and just give it clean PH level water without the nutes for the 2 days. Thus your PH will be some what under control.

If your ph gets way out of whack in just a couple of days then you have bigger fish to fry......

You guys are all awesome.