i use the baby cottontail with adult cotton tail. And as for time it just depends on the animal. I usually start out very low sound and after 4-5 min I will let go quiet for about 2 min then go a bit louder for 4-5 min. If I don't get anything to come in after 45 min we are usually gone. HAPPY HUNTING
Hey Blue, I don't locate ever, I have lived here for 35yrs and I pretty much know the country. If you have alot of Jacks use the jackrabbit call, I would suggest to mix it up a bit if you are using Jack alot switch to cottontail or a different sound they are not used too this will increase your odds also. I use the wind as much as possible but I usually don't put it in my face I will use a cross wind as you will get sound to travel farther with a crosswind than trying to call right into the wind. Your terrain will dictate whether or not you can do this. We are having great luck this yr as this weekend produced 5 more. No pics as we forgot our cameras. Anyway hope this helps. HAPPY HUNTING