Constantly or frequently.
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.
An extremely long time.
A mythical time in the infinite future that will never come.
Permanent, lasting; constant, perpetual.
To a certain degree or extent
To such a quantity, degree etc.
A particular amount, often a large or excessive amount.
A demonstrated amount.