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Hi Rafael and Murray    

    Rafael,thanks for elaborating a slight different version of using a stopwatch. I think your method would always come down with equivalent accuracy since we are basically doing the same thing,only difference being that you're timing the duration between the sights and the next whole minutes.

   Murray,I have to admit that digital stopwatches are superior to mechanical ones in almost every aspect, they're waterproof, easy to read, can do laps and record them(although mechanical ones can do the same but still, you have to write them down before you attempt another ). Being somewhat anachronistic in the digital age,I also wouldn't choose to use them if I wasn't being so obssesed with these little buzzing things.