Depends on how responses are progressing as the season goes on. Usaully around the 3 week of october i will start and while in stand rattle every 2 hours, as the rut approaches i will increase that frequency sometimes up to every 30 minutes. Depends on how i feel in tthe tree. Sometimes it can do more harm than good, other times it canmake a crappy hunt a harvest real quick. I think techniques vary quite a bit. My most commomn is probably a 1 minute sequence followed by a 2-3minute wait another 1minute sequence, and 2-3 minute wait and one last 30 second sequence anticipating action the whole time scanning and scanning the area for movement. once movement is spotted i rely on the buck to come natural or if he is reluctant grunt him in. This has worked great for me over the years. Its surely an aggressive approach.