What does "for the long haul" mean?

For a long time; for an extended period or duration; all the way.

For the long haul

adv

adv ·Rare ·Advanced level

Adverb

1
For a long time; for an extended period or duration; all the way. not-comparable
"I'm not in it for a season; I'm in it for the long haul."

"I'm not in it for a season; I'm in it for the long haul."