My little Wasabi got his front legs about an hour ago! He is so cute!

So I lowered the water level a lot...he is still able to be completely under, but then I have a gravel slope to make some land. I also have a rock and stick coming out of the water.

How long until he comes out? I read he will lose his gills for lungs in 24 hours, I don't want him to drown! Any advice?