What is the max recommended time between japanese encephalitis vaccines(usually 2 doses 28 days apart)without having to start the vaccine course over?

Go for it: As long as the vaccine was stored properly you don't have to "start over" because of an extended time after dose one. Another very effective approach is that before you go to wherever it is that you're going spray your outer garments that you will be wearing with 0.2% permethrin (Permanone Tick Repellant). After you don the clothes parts of your body will not b covered. That's where u put DEET. 99