Issue of not wanting customers that take too long to finish more an issue with independent European providers, used to happen to me quite a bit when younger. The Asians loved it and would tell me best time to visit. The Latinas were nonchalant, but the Euroes were frustrated. That is, unless they took a liking to you and were nymphoes, which happened a few times too. Then they'd suggest you come late and allow you to spend the night.