I've got systems that I renovated with MPs and right now in our current heat wave I've got them running two hours three times a week in some cases to get some water deeper into the soil. I don't have a problem with it but customers conditioned to 15 minute run times are really struggling with it. Sometimes in mixed shade sun lawns I will switch the MPs to RB rotators in sunny areas to help shorten the run times. I find on the WM SL that I need to set the precip rate at .3"/hr. I find myself in this heat much preferring the RB rotators over the MPs. The RB fish tailing is a real problem but if I can't make a flow control adjustment I find that a slight turn in the nozzle screw will slow it down without hurting the distance and coverage. Because of the long run times I'm splitting the zones and days up to make sure I can get my watering finished by 6am. Once again a population conditioned to MWF watering struggles with this.