I have used an RH designs Stopclock (enlarger timer) for the past 6 years and I love it. Fstop printing, test strip function in 1/4 stop increments, 2 channels and multiple burn in sequence memory programming. Best of all its really simple to use!
Now the downside. It only goes up to 255 secs. Sorry!
I use a separate cheapie digital triple timer for process timing