At any time
"you're welcome" in response to "thank you" or "thanks."
Suitable for any time; not associated with any particular time.
For all time, for all eternity; for a lifetime; for an infinite amount of time.
We had to wait forever to get inside.
For a very long time, a seeming eternity.
Constantly or frequently.
An extremely long time.
A mythical time in the infinite future that will never come.
Permanent, lasting; constant, perpetual.