I have done several PH cycles of mainly 1 test & 4ad. I never really noticed much of anything for gains until the 3rd week. You will look a little harder & gain a couple pounds weeks 1-2, but the real changes take effect in weeks 3-6 for me at least. I don't notice any shutdown or libido loss until the 3rd week either. For me to stop at 2 weeks, would be usless IMO. People respond differently to PHs, maybe you will see gains sooner than me. I also notice that gains slow past 6 weeks.
Methyl 1-test is different. gains are said to be almost immediate & great gains can be made in only 2 weeks, that's why everyone is cycling 2-on, 2-off.