I believe there are many professionals who check their email all the time. If you are one of them, think about breaking that habit. If you read your email every hour for 15 minutes that’s quite a long time – maybe you could try to read your email only once in the beginning of the day (for 10 minutes) and once in the end of the day (for 10 minutes). Resist the urge to have a “quick check”.
Try what suits for you, but try cutting down email usage. Try this experiment for 30 days and see what happens. Use it the way it suits you: if you spend 1 hour daily, try to use only 30 minutes. Reduce by 10%. Even a small step is a good if you are really addicted to checking your email.