| Flats... Never
Rounds... when they lose their twang. I have lots of basses so it is hard to say how often but I would guesstimate that a set of strings would last me no more than 3 weeks with heavy playing.
Tip... Buy strings in bulk on eBay. I buy EB sets for $10-15 (5 or 10 at a time) so switching often isn't that big a deal financially.
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Basses: Fender - EBMM - Gibson - Modulus
Cabs: TC Electronics - Sadowsky - Mesa
Amps: Mesa - Hiwatt - GK
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