No, they're not. Say: How often do you go swimming at the local ( swimming ) pool? or How many times a week do you go swimming at the local ( swimming ) pool?
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lucas21c1. Are both of "How often do you go swimming at the local pool a week?" and "How often do you go to the library a week?" okay?No.
lucas21c2. How about "How many times do you go swimming at the local pool a week?" and "How many times do you go to the local library a week?"No. It's "how many times per/a week..."
lucas21c"How many times do you go swimming at the local pool a week?" is not?It is possible, but the time phrase "times per week" is much more logical because it has the measurement together with the units.