Sounds pretty normal to me too.
I Just added one to my tank about 2 months ago. He was under a rock for 2-3 days, then moved up to a hole and stayed in there for a few more days. Then slowly out more and more. Now he is probably in his hole for 1/3 of the day, and out and about the rest. Previous Midas Blenny experiences have been the same.
Great and hardy fish. One of my favs.