Is brushing teeth for 8-10 mins bad?

After I switched to an electronic toothbrush I often lose track of time and end up brushing for 8-10 mins (partly because brushing with an electronic toothbrush is so effortless). Now I brush for so long because I can't stand it unless my teeth are smooth. Is brushing for such a long time bad?

(I brush 3-4x a day). (Also, the walls of my mouth shed a lot. Is this related?)

Thanks!

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