Could you please help me correct these 4 sentences?

Could someone please help me correct these 4 sentences grammatically?

1 The nights seems so long when you are at work. The times doesn't pass when you're at work. It seems like it's 3 am for hours.

2 The barrier delineates this area from that one.

3 I've never seen anyone as happy as him to have their new internet site up and running.

4 Let me know 10 minutes before you get here that you are here.

Thank you so much