Your routine isn’t identical(did you check reddit for 2 minutes before you jumped in the shower or 5 minutes?), outside factors(your dog took an extra minute and a half to use the bathroom outside), absentmindedly wasting time(you look at the clock “oh, I’m ahead of schedule, I can take my time making breakfast”).
Small variations in time per task(you might shower in 9-10 minutes every morning, only 10% variance, but that’s a full minute of variation every day) will add up as your sample size grows(the number of days you are paying attention).
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