How likely is it for someone to contract hiv after using a razor (for shaving) of someone who has hiv? how long would it take to show up? been tested

Not likely:zero risk: It is fully unlikely. There is ZERO risk here. HIV, unlike some other viruses, does not survive on inanimate objects and is not transmitted in this manner. You do not need to test. You cannot get HIV this way.

Unlikely: Unless blade was contaminated with blood containing HIV and one cut oneself during shaving with it. The older third generation HIV test does not show HIV for 2 to 8 weeks (average 25 days). The fourth generation tests can detect HIV in 11 days to 1month after infection.