Best transition to fast forward video
There is no magic transition that will help you. Simple cuts usually work best. A fade through black may help convey a sense of time passing. The most important thing is to think about the story you want to tell. Select the material that is important to telling that story, edit it together with cuts, and then add complex transitions only if you need to work around something awkward like a jump cut. People won't want to watch the uninteresting parts if you keep everything.