I check three times a day: morning (for overnight traffic/sales), midday (to see how the day is going), before bedtime (see how the day went).
Rinse/repeat for years now.
Thing is tho: just because you check every day it's good to note that you must take a longer view with stats. Like a week or a month. Emotionally connecting to your stats on a daily basis is a rollercoaster ride and distorts reality.
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