When getting the gardasil shot, do you have to get the shots within a certain period of time?

Yes. There is a schedule for the Gardasil vaccine. You get the first dose, then get the second dose 2 months after the first dose, and finally the third dose 6 months after the first dose. 3 shots total.
Gardasil. First shot --> shot 1 month later --> shot 6 months after first.
Yes. Gardasil is a vaccine to prevent cancers and warts caused by 4 strains of hpv virus. It is approved for females ages 9-26 years. Recently, it got approved for males also. Some doctors wait until girls are teens before giving the vaccine, as that is when sexual activities often begin. The second shot is 2 months after the first, and the third shot is 4 months after the second.