Nobody?

OK, let's boil it down to a couple of questions.

If I run my main circulating (filter) pump on low speed while heating up the spa, is it going to take a lot longer to heat up? I wouldn't think so - the heat input of the heater is the same.

How many standard 2" pool returns (not jets) will I need to flow 30-40 gpm to the spa? I would think one would probably do it, two at the most.