I guess it would depend upon what time of the year you visit the Animal Kingdom, and how early in the morning you arrive at the park.
I don't worry too much about wait times. For example, I first rode Expedition Everest in a busy day in March. It was crowded, and I waited until afternoon to ride the coaster. The first ride, in the standby line, was about 30 minutes (even though the posted wait time was 80 minutes); and the second ride took me about five or ten minutes to be seated, using the single rider line (which I think was also part of the fastpass line).
How a long a wait? Hard to answer. Depends.
Enjoy.