If it's your only choice then you really should give it a try. Those plants are still relatively small. So my guess is you'll be pushing it. But the plants will likely live. I'd fill your buckets as full as possible the make it the last thing you do before leaving with ph 5.8 H2O and a fairly weak solution (300-350 ppm).. Then correct the mix immediately upon return with more H2O. I'm in my 4th week of budding and my girls just survived a week long business trip using this method. But admittedly, I was pushing it.
Play the hand you're dealt and good luck! Be sure to post and let us know how it goes.