Two LP sides (40+ minutes) sounds like a long time to me. Are you sure this is all due to the cartridge? Was the rest of your system already warmed up?
In my case, using a Benz LP, the cartridge seems to be fully "warmed up" in something like 5 minutes. Initially it sounds a tad bright but it settles down during the first few minutes and I really don't notice any more changes after that.
My electronics are a different story. My tube power amps sound a lot better after about 30 minutes, and I suspect that one of them sounds even better after a couple hours, but it is hard to judge that kind of change over a long period like that.
In my case, using a Benz LP, the cartridge seems to be fully "warmed up" in something like 5 minutes. Initially it sounds a tad bright but it settles down during the first few minutes and I really don't notice any more changes after that.
My electronics are a different story. My tube power amps sound a lot better after about 30 minutes, and I suspect that one of them sounds even better after a couple hours, but it is hard to judge that kind of change over a long period like that.