Takes me 1-2min to put on my max-vac and I use one sleeve directly on the penis and two sleeves to create the seal. Since the Vac-Hanger only has 1 sleeve it should go on even faster. Also, I started hanging for 1hour the very first time I hung, (I used light weight!), and had very little fluid build up.
If one hang with light weights and make sure little to no foreskin gets on the inside the vacuum container, there should be very little fluid build up.
I should also add that I had been using a vacuum ads for a couple of months before I started hanging with the max-vac. I see no problem with hanging up to one hour but you have to keep the weight down.