For a very long time, a seeming eternity.
We had to wait forever to get inside.
For all time, for all eternity; for a lifetime; for an infinite amount of time.
Constantly or frequently.
An extremely long time.
A mythical time in the infinite future that will never come.
Permanent, lasting; constant, perpetual.
In a lengthy way, in a manner that is long and drawn out, especially in time.