From what i have reseached the half life of acetate is aproximately 3 days,but everybody is different and has a different metabolism,mine is a fast metabolism. the Prop ester is about 3 to 4 days.the enathate ester is about 12 days. i do all of them every 3 days,i did an everyday cycle and could not see any difference between that and a 3 day cycle other than less shots,the sides were the same with either shot frequency.I believe your blood level is going to fluxuate any way no matter how precicse you inject. I am going by my actual experience. No doubt every day shots would be the best way but that gets old very fast....