For all premier chains I go in looking to spend usually no more than 200/250 for Bbbj/fs. Whether it’s a 30/40 min or even a 45 at S9. Example bbbj at S9 I’d leave 30 since the 45min rate is 170. But for 30 mins I’d leave 50 for the same service, since 30mins is 130.
Of course if the quality is better they earn more.