1) I'd just say "How much is the rent"? 2) it means "You've lasted out till the end". I guess it can be used figuratively i.e. "You've managed to complete a task". 3) "Are you a Westlife fan?" 4) I'd use "a lot of" instead of much since this is an affirmative sentence. I'd write "She has a lot of experience in that field". For the second one, I'd use "with": "She has a lot of
What's the rent on that? "gone the distance" means "made a special effort", "done especially well", "completed the task thoroughly with attention to every little detail". Are you a Westlife fan? She has a lot of experience with that.