Talk:Double XP Boost/@comment-25175720-20150613162013

I'm thinking of buying XP boosts to maximize obstacle clearing on the new island. I prefer to buy just one day's worth for large obstacles with high XP payoffs. Does the boost kick in at purchase time or at time it is ready to actually clear? Does it still work if I've initiated the clearing process, then a or two day later buy XP boost to kick in when I initiat the final clearing step? It matters as some obstacles take more than one day to clear.