How long can I wait until Harvest?

I would harvest now. I think you would be too far out after vacation to wait. Let alone all the issues that could happen with the grow in those two weeks. Also, the other issue is your dry then storage. You are in a serious pickle because dry can be 7 days and then they need to go into jars. Which can be achieved before vacation. The only downfall, once you get them into jars, they need to be burped every day for the next week or two or else they won’t cure properly. So if you have someone that can do that for you, great. If not, you are running the risk of your final product not being all that great or even worse, mold issues. There is always another option, if you can harvest your plant, and have your dry room/tent or whatever set to 60% humidity and low temps (as close to about 60-65 degrees) while you are on vacation. They can sit at that for a very long time and you can wait to jar them after you get back from vacation. I hope this helps.

Chop now Good advice below by AsNoriu and Organoman

i doubt it will go 2 weeks without problems, would harvest now. BUT !!!! overdrying buds during drying process is very bad too, someone needs to put them in jars and cure after 7-10 days of hanging, depending on state ... if you cant secure it, better let her go for 2 more weeks and chop then.

Never listen to what the breeders say when it comes to flowering time. I have had strains that were supposed to be ready in 10 weeks from seed take 15/16 weeks to finish. Trichomes is the only reliable way to tell if your plant is ready or not. If you have a majority of cloudy trichomes and the plant still hasn’t produced enough « crystals » then it most probably will not produce any more. Good luck.