The Hein mini is fairly slow and time of course depends on kite size. There is obviously no low pressure phase. Some of my kites have individual struts which require balanced high pressure (10-12 psi) which can't be achieved with a manual pump. I normally use a hand pump to do the LE. I mostly use the vehicle pump (2nd pic) which is higher volume. The little one goes along when we use the jetski to go kite.
The coolest part, IMO, is the wand with built in power button and gauge. It puts you right by the kite valve and lets you achieve a very exact pressure. -If you are into that kind of thing.
if you want to see these produced. Maybe we can do a group buy since the pumps are not readily available. They were configured & made to order and I designed and custom built all the additional components.