I would say 45ish.
You can make a little adapter to feed a garden hose into the water pickup and start it up out of water. Its not a water jacker ear muf looking thing you would put over an out drive, its a port on a jetski.
Even if you just started it up for a few seconds out of water it would be ok, but dont let it run for over 15-30 seconds or so. But a hit the choke and start it, knock the choke off and let it idle for a few seconds is ok without water in the block.