Hey guys simple question. If you mix HCG power with BAC water and refegirate it how long does it last?

I want to start HCG week 5 into a 10 week test cyp cycle. I am going to take it up to 10 days before PCT. So a total of 6 weeks. If I get a 5000 iu vial of HCG and mix it with the BAC water in week 5, will it be bad 6-7 weeks later? Thanks all.