8 questions need help with please

Could please help me look at these sentences gramatically?

1 How many minutes are left till/before the end of the show. can you put TILL?)
2 How much more time do we have till/before it dies.( TILL???)
3 I've been around 3 decades more than you./3 more decades than you.
4 She gave us the brush off without so much as an explanation.
5 I can't do anything against her powers.
6 When you eat a lot of the same things, you don't need a light in the kitchen to know how cooked the meat is, you know how long to leave the meat on the heat before its cooked to your liking.
7 I want to follow this thread

8 That's too hard a name to remember.

The team scored in the time it took me to make dinner. When I got back from the kitchen it was 1-0. (how would you say that?)

thank you