If I’m going to change strings, I do it a day or two prior to a gig. I then play the new strings hard for a bit, re-tune, play, tune, etc., especially if the gig is the next night. When I played D’addarios for years, and then GHS Boomers for years, I would change before every gig and the strings lasted about three weeks before they would noticeably lose something. Since I’ve been using Optima Gold the strings last much longer. They still sound good two or three months later. As a result, I no longer re-string for every gig.
Bill, tgo