Getting stationed unseen and unheard is very important. Time calling is a bit of a feel thing. If a quiet day and the sound rolling far into some scrappy country I sit longer. Overall I'd say I average 15-20 minutes. When I have heard actual rabbits in distress, they usually don't stop screaming until it's over for them, hence when calling I call more than keep quiet. More sound doesn't hurt. Varying volume I feel helps.
I know, many situations for others are different.
To the poster from the wooded east.. Try making use of all the deer stands not in use during the calling season. Most deer hunters clear an adequate shooting lane or two. In northern MN there is no shortage of them, I'd imagine the same in your area?
Hef-A
