Ok here is a very tiny MC from my job!
Where I work, secretaries book appointments for various professionals (I prefer not to give details, you never know). The time slot for each appointment usually is 20 min, but can go up to 30 or down to 15, it depends on how fast a professional is. Secretaries know each of them and book accordingly.
Obviously, the more appointments, the more gain, so one of the 20min professionals started making a fuss that he wanted 15min time slots… The secretaries, knowing he was always running late even with that time slots (he should have been 30, but he had already demanded to be 20 a while back), just smiled and did as he wanted.
Cue him being absolutely slammed during his next shift… He just wasn’t fast enough, and clients were loudly complaining about being late… A mess.
Guess who went back to 20 minutes per appointment?