Welcome! Trim when you get damage or when you want to "shape" your hemline. How often that is, is individual I trim 0,5-2 cm twice a year, while others goes years without needing to trim at all. I also S&D in between trims. So just "sit back" and see what happens
You can always join a "no trim challenge", like "no trimming 2020 first half only", if you want to
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