Hours and minutes e.g. 3h 5min
Starting and finishing times e.g. 954-1023 for start at 9:54 and stop at 10:23 (if stopping in the same hour, you need specify only the 2-digit minute after the -); a button to start/stop at the current time is provided
Arbitrary items, by placing your chosen abbreviation of the item immediately after a number, e.g. 1m 2t 4bk
To track other projects, precede some numbers with one or more letters e.g. x3h x45min y9t: each prefix gives a separate total.