We started swimming in late May, so we'd been swimming 4 weeks when we left. The only issue with the lower CYA was that I usually added bleach when I got home from work instead of waiting until we were done swimming for the evening to maintain chlorine.
The only negative affect they'll have is adding CYA and tending to lower the pH. If you can get your CYA low enough before you go, you'll be fine. Many people use pucks when they open to add CYA, then switch to bleach when the CYA gets where they want it. I've just settled on 35ppm because my pool always has FC high enough after the sun goes down.
If you don't run the pump, you'll be sorry. I have a timer now, but I used to have a neighbor turn it on one morning, then off the next. That way I got some circulation without it being too big of a pain for him.
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