
For question one: There's the current timeline where the series actually takes place & there's the future/timeline that trunks comes from.
Eh...think I might be missing one still...hmm...

Question two: Trunks arrives to tell of andriods and give Goku the medicine. Trunks returns to the future. 2 trips.
Cell takes a ride from the future. 1 trip.
Trunks returns from the future to help fight the androids, then goes
back. 2 more trips.
At the very end of the cell saga we see trunks in his time about to return but then cell appears and tries to steal his time capsule again. He fights and defeats cell. I don't think they actually show trunks leaving again, so if assume that he does, that would make two more trips.
So were looking at 5, maybe 7 if we count the trips at the end we don't actually see him make, or do we...gah..I can't remember

Great questions marauder!! Certainly some thinkers
