As I recall, some space disease brought on T'Pol's pon farr unexpectedly, so by the time she got back to Vulcan she probably would have been dead.The most anal review is on IMDB, where someone takes issue over a woman (T'Pol) going through pon farr and her not trying to go back to Vulcan while affected. To me, Spock's line of going home to spawn is only there because of T'Pring.
I wonder if Vulcans have some means to cancel or defer the pon farr? Sort of like a "little green pill" you can take for those deep space missions.
And do they all go through it at once, or does it take for ever for their cycles to sync up?