It depends on if you are using HCG alone or with testosterone and how you respond to it.
Did your doctor prescribe it? If so, what dose did he prescribe?
I use 100 mg test cyp per week with HCG 500 IU twice per week on Monday and Friday (which comes out to every three or four days).
I've also heard of some guys on T and in studies that take doses of 250 or 500 tree times per week. Again, it depends on how one responds (subjective feelings, fertility, lab values).
When I was on HCG monotherapy I took 3000 IU three times per week.
I think people are making this shit way too damn complicated, as if they are going to tune medicine dosing frequency so fine and as if they are going to even feel negligible changes in hormones throughout the week.