Vicinity vs Proximity / Sentences need help please?

Could you please help me with this? Which would you say?

1 The 2 monuments are in close proximity/range/distance to each other.

Could you please tell me what you think of this?

- I don't know how long it'll be before I can go back.
- They held out 30 min under such pressure.
- I had to run into her, my luck.
- Why sacrifice yourself for someone who isn't going to make it to begin with. He was a dead man.
- I have as many days off as I have days at work.

Thank you