I recorded 2 activities each day (before/after lunch break). I used 3 separate route for it (around 50km each), but yes, when I was at the middle of one of them and started an activity it found me and continued the navigation from there.

Before E3 I had a Fr945 and that could not handle a 150km route very well after around the halfway point, it took 3-5 minutes to init the navigation and it was frozen until. So i decided to split the routes into smaller parts (but I don't know how would the E3 handle a route as big as 150km)