Never. I get enough playing time daily and equally as much in my studio working on new material. I might do a few runs to check out sound, but that's about it.
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Live: Korg PA4X/Bose L1 Pro 8/Senn 935

Studio: Korg PA4X/Kawai MP7SE/Tascam DP24SD/Sony C80/AGK 214/ATEM Mini Pro switcher/