Simran becomes bad for you when you ignore duties as a Householder, Saint and a Soldier
Veer Ji which of those three does not involve Subtle-Simran or Static-Simran to be carried out properly.To the one posing the question if I were you I would worry more about how much is too little.
I can tell you as a Householder
Gurmukh Rom Rom Har Dhi-aavai
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Veer Ji If I have understood anything it is that the House is the holder,and when 'Ghar' wali starts I pretend to do Silent-Simran Aka Sleep