I feel a shot of Test E 250mg the second day. I felt a shot of Test D 250mg the second day. It's all subjective. My lifts were going up easier and I was doing much more sets. Some will say it's mental, but for me, it's right away.
What saps wrote is a quality post and I agree 100%. When I used test E i was experimenting, I tried once a week at first, and once every four days a couple weeks after that. I was much more "emotional" from aggression to depression. I bumped it up to once every third, and it all disappeared.