1. It’s not clear what are you asking. You need one session for each FB account. You can use the same session on all websites.
2. It’s not a problem by itself. You can have as many session as you like. Just don’t compromise them by spamming or doing other not allowed stuff.
3. Facebook session lifetime is 3 months. Each post extends it for 3 months from the date of post. So If you make at least one post every 3 months session will stay active, otherwise it will expire.
4. If Facebook bans you all your sessions sill be suspended as well. SNAP is not a secret workaround for Facebook bans, If you account is suspended it’s suspended everywhere.
