A real doe bleat is about 3-4 seconds long. Volume is important as most times a deer hunter will not recognize a bleat from a real doe as it is so low at volume and short. The calls on the market tend to produce the same sounds but only in a higher (farther away) type call.
Bleats are really a location call made by doe and fawns in the dark but I have heard them from fawns by themselves in the light.
Buck grunts are the same only they tend to run longer unless you here the tending grunt that is somewhat higher in volume and very short blurts done in a row as the buck is chasing. The best realistic sound I have heard for a grunt is to take your finger and run it down the teeth on a comb...