Its all about applying it thinly. Apply via microfibre applicator, nice and thin and you can leave it to set as hard as you like and it will buff off. Anything over 10 mins has diminishing returns, the only reason the detailler left it longer on Martins was because he was doing the wheels and wheel arches in the mean time.
Dodo SN is pretty amazing stuff. I never beleived it when I was told it would make the flake pop more, but it does and it works. Martin and Chris were both converts as soon as it was done. Red Mist had a staggering effect on Martins, giving it a much glossier look.
Also remember with Dodo SN, being carnbuba, it will give off oils in the heat as it cures, even after you buff off the most of it. So sometimes you need to go over it again with a MF cloth shortly after and it brings it up really nice. Or go over with Red Mist which mops it up