that kinda depends on the strain and the environment like heat and light, dont worry too much about over ripe buds, the inside of the bud is more protected and trichomes in there do not oxidize so easily, even when you have amber on the top of the cola it would take a couple of weeks for the rest of the plant to catch up, that why you look for a nice mix of trichome colors, you try to asses at what point the most trichomes are cloudy so focus on the clear trichomes, once theyre gone youre good to go