Well...the time isn't the biggest factor in crow hunting. It is very difficult to stalk crows, so here is what you should do. Build a nice camouflaged shelter, and about 20-30 meters away, place some form of raw meat or eggs or decoy owl (see what suits you best). Wait for a long time, and you should be in luck as long as you are well covered. Remember though, crows are difficult to get in any circumstances, so luck will have to be on your side!

i have heard a good bait is a rabbit that has been opened up and laid belly up,the crows and magpies will it from a good distance...

What is your main interest. shooting,fishing