will have been prolonging
-habré estado prolongando
Future perfect progressive conjugation of prolong. There are other translations for this conjugation.

prolong

Popularity
500+ learners.
View the conjugation for
Spanish verbs 
Cheat Sheet
PREMIUM
This data is provided by Onoma
Examples
Other Dictionaries
Explore the meaning of prolong in our family of products.
Word of the Day
stamp