My log book has hours and minutes columns.
Tacho time does not relate to flying hours,where I think .80=1 hour engine.
In our group we are charged on tacho time.
Flying time is when aircraft moves under it's own power on taxi to take off and when I park at the fuel bowser after flying,anyway that's what I log now.
At one time I was logging take off to landing but was told that was not the usual way to log it.
So in fact I probably have a fraction more hours than it shows in the log book!
Lister