Permanent, lasting; constant, perpetual.
An extremely long time.
A mythical time in the infinite future that will never come.
We had to wait forever to get inside.
For all time, for all eternity; for a lifetime; for an infinite amount of time.
For a very long time, a seeming eternity.
Constantly or frequently.
unlimited
all-you-can-eat; all-you-can-drink (of a specific food or drink)