I agree with you that it's harder to wait for someone that is why we choose for ourselves what or who we wish to wait for but the important thing is, is the person or something worth waiting for? Don't wait time in waiting for what or who wouldn't come by.
As for you and your friend, if you value the relationship very much, keep in touch with her and let her know that you're waiting. Don't stop waiting if you think she's worth any length of your wait.
Just my suggestion though.