Hi,
every now and then, we all have this chore of updating the flight book and the pilot log book with these hard to calculate hours and minutes.
So several years ago, I made a web page for that. But that was even cumbersome, so now I have made an Android app for it, minimizing the number of key strokes needed.
Feel free to use it yourself.
https://play.google.com/store/apps/d...hny.flightcalc
Johny