RE: How long for a Cow moose Call?
I usually like to to do a series of calls...I start with a 4 second followed by 8 second call followed by a 6 second call.
To be honest cow calls probably will be getting less effective at this stage in the rut(which is ALMOST completely done by now). However, I can say that 1 year I called in 3 bulls in the middle of October so it is NOT impossible but that was under perfect conditions(NO WIND for several days) and in a area with HIGH population.
Your best hope is to know EXACTLY where a bull is and set-up close to him and let out a few soft calls...
As for the sound...the best way I can describe it is to roll your tongue back so it touchs roof of your mouth and sound out the letter RRRRRR...
Then once you have practiced that try and start your call at a low pitch then increase volume and pitch then drop it off at the end...
GOOD LUCK!!