this may be the crazy way of doing it but this is what i do.

i write down the times while on the trip on my release, just incase the fms goes out. thats it. then when i get done from my trip i pull up crewtrac and log my time by exactly what it says in the system for the day. for example if i flew three legs that day totaling 6:14 of block i would write in my log book all the legs in one space (mem-bos-ind) and put it in as 6.2 all my times come from crewtrac so i don't have to worry about that other stuff.