lack of sensativity

i was circumcised just 3 days ago and as yet have no feeling in the glans at all, to the point i can run cold water on it and i cant feel a thing
surgeon never mentioned this only the fact a local was used so once tha wore off it would be sore. i have no pain apart from the scar area and as i say no feeling in the glans
is this normal and if so how long will it last