Yes, at least an hour, 90 minutes is better since you will be leaving Pop at a time when busses are running less frequently to and from the parks. Bus to MK, then a boat or monorail to the Polynesian. If you happen to catch transportation just right, you will have time to walk around the Poly and explore. For the amount it will cost, I would do a rideshare. It will cut your transportation time and won't cost all that much, probably around $10 before tip.