Thanks for the reply.
Seekbars are an option I'm considering. I haven't used them in b4a yet but I have downloaded a few apps from Google Play (no idea what they were coded with) with seekbars and quite often they've been clunky to use. You want to set it at a value of, say, 100 and you're constantly jumping around between the low 90s and 106/7+ trying to get it to exactly 100. This is more apparent the higher the maximum value of the seekbar.
I will try my app with seekbars first but would like the option of letting users be more exact with the timers without getting frustrated.