What is a abstract verb for adjective long?

There isn't a single, perfect abstract verb for the adjective "long." The concept of "long" can be expressed in many ways depending on the context. Here are some possibilities, along with examples:

* Last: This implies duration or continuation.

* Example: The meeting lasted for hours.

* Extend: This suggests stretching out in time or space.

* Example: The deadline has been extended.

* Prolong: This emphasizes making something last longer than usual.

* Example: We prolonged our stay at the beach.

* Endure: This implies something lasting through hardship or difficulty.

* Example: The ancient temple has endured for centuries.

* Persist: This focuses on something continuing despite challenges or obstacles.

* Example: The rain persisted throughout the day.

The best verb to use will depend on the specific meaning you want to convey.