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As often or as little as you want. Generally if I am cycling a tank, I will wait a week or so and then test ammonia every day, and after another week start testing nitrite as well.
Yep you can test daily or weekly. If its your first tank i suggest testing daily or every few day so you can see the processes taking place and learn whats going on along with learning how to properly use your test kits etc and learn about water chemistry some.