be in something for the long haul
Be committed to an undertaking until it is completed: we are in business for the long haul...- Smartphone vendors these days tend to focus on short term profits instead of being in the game for the long haul.
- He assured management he was in for the long haul.
- The big stores need to see evidence that you're in it for the long haul and not just some chancer who will last for a couple of seasons.
See parent entry: long haul