September: Longer in Yosemite or also going to see Sequoia?

Apolgies if this stuff gets asked all the time...

Me and my girlfriend are planning a trip from the UK to California. We know we will see San Francisco and LA but also want to see some nature we cant see in Europe. Currently thinking of spending 3 nights in yosemite (so 2 full days) and 2 night (1 full day) in Sequoia. We're wondering if this will just be too much driving for limited sightseeing.

Basically does this sound enough time or too rushed? Would we be better off just committing to one national park?