Hi and welcome to the DIS!
If one or more of these things happen you might be sweating it out:
1) Your flight is late.
2) You need extra time to get off the plane, for example if you are sitting near the back or sitting behind people with small children.
3) You have trouble finding where you are going to get your ME bus.
4) You run into traffic leaving the airport or on the way to POP.
5) The line to check in at POP is long.
6) When you are ready to go to dinner, you just miss a bus from POP to the MK.
7) When you get to the MK you just miss a monorail to the CR and have to wait for the next one or have to walk to the CR.
You an eliminate numbers 6 and 7 by taking a taxi from POP to the CR. Other than that, if everything goes well you will make it. But if you run into some problems you will be late.
Good luck!!
Bob