a couple is usually two, like a pair. But most people use it to mean a few, like 2 or 3 minutes.
Please consult with a doctor for a correct diagnosis. The internet is generally unreliable without proper context/information/examination
yes
For alcohol to disappear.
You're batter may be slowly dying . It could be you're alternator that is draining it. Or you're starter may be going. I would start with the starter.