I agree with the above posts. Our wait time from when we decided to actually set a date wasn't very far in advance but for the last 10 years it has always been "5 more years" whenever we were asked. There were certain things we wanted and a certain place in our lives we wanted to be and just weren't there yet. We are almost there now. I will say this though as far as helping time pass when there are huge life events you are waiting for that has helped me out tremendously, focus on smaller goals to help break up the time. This also gives you little checks that you can put in your column to help you pass the time as you get to each one. That way you aren't looking so much at the long stretch, but little ones. Like if you plan on moving, or getting a new job, or school, or a vacation you are planning. Etc. An easy metaphor (although ttc is by far more exciting) I can think of is cleaning the house. If the house is trashed and you look at the overall picture it can be easy to get a little overwhelmed but if you break it down one chore at a time, 1 room at a time, its easy to see your progress which helps keep you motivated and before you know it, the whole house is clean. (Like I said not nearly as exciting but same kind of concept)
I hope the time passes quickly for you.
Edited for spelling