I think you will be best in reading the container of the thin set, however remember that thin set, like concrete, does not dry when it cures. It is a chemical reaction with the water that builds the strength. Temperature can make the chemical reaction happen faster, however water is needed IN the reaction. What I am getting to is, do not try to dry the thin set.
Back to your question: If you are leaving for a couple days, I would wait that time. Remember to remove ALL your spacers and REALLY work I your grout on a diagonal to you tile. Take your time and really force those lines full of grout. It can be a workout, but doing it yourself is both a $ saver and very rewarding. GOOD LUCK !
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