D&D 5E How long did your group take to finish the official WotC adventures?

[Burnside]

Lost Mines of Phandelver - Took roughly 10 4-hour sessions. Players were almost 5th level when finished.

Curse of Strahd - Took 22 4-hour sessions. Players hit level 9 upon completion.

Tomb of Annihilation - Currently in this as a player. We'll do session 28 this month and have just hit level 9. We've been in the final dungeon for two sessions but feels like there could easily be 4-5 more sessions to go.

 

[Retreater]

I run pretty fast paced games. We average an adventure in 6-9 months, meeting twice a month for 4-5 hour sessions.