My ears are burning.
Note that this is with a rotary, but it should work the same with a PC, and this is primarily RyDawg's fault, as he's the one that told me about working Menzerna finishing polishes longer than, um, "normal". But when was the last time we accused RyDawg of being "normal"?
This works best if you are working under direct halogen lighting, otherwise it's hard to really see the appearance of the polish.
Most guys stop working diminishing abrasive polishes as soon as they turn clear, and that's good, that's normally when you'd want to stop. Menzerna *finishing* polishes (this does *not* apply for SIP, IP, or Power Gloss) have two different levels of "clear", though. The first stage is what you'd see with other diminishing abrasives: the polish goes "clear". Don't stop at this point. Continue working the polish (as long as it hasn't dried on you. If it dries, stop and re-apply) until it looks like you just put vegetable oil on your paint. It will look very glossy and very oily.
It may take you a couple of applications to get the polish to give you this long of a working time. I don't know why (maybe the accumulation of lubes?), but the more applications you do of a Menz finishing polish, the longer your available working time. Just remember that you do need to stop if the polish dries up on you. Just stop, remove the residue with an MF, re-apply some more polish, and start the break down process over again. Having a very well primed pad helps a lot, too.
Also, don't use a lot of pressure when you do this. The more pressure you use, the more heat build up you'll get, the quicker the polish will dry up on you. On a PC, use speed six and light pressure.