Sustanon kicks in at peak blood levels of testosterone in less than 5 days cos of the prop and isoprop. I feel sustanon's effects in less than 2 days. When people refer to kicking in they simply mean the abrupt kick that occurs due to testosterone accumulation from all of their recent shots; testosterone levels will be sky high when one has administered drugs that last 3 weeks once or twice per week for 4 weeks.
PS: that dose is fine. I have been on SInce May and I currently using the same dose - albeit I am using test enan not sustanon. I am still growing a bit, leaning out a lot, and getting stronger and stronger. I have also thrown the HCG in the mix...
bro, your cycle is good, my first cycle is the same as the one you're on now. and yes, always feeling horny and want to shag all the ladies. sus kicked in around week 3 for me, workouts are insane and felt really strong.