Many, many questions to Riot about pre-season 8 and beyond.

I have seen the video and read the notes about the new system for IP => BE, and still have lots of questions because I grinded for 5 seasons.... yes 5 seasons! and this day has finally come and now I'm happy yet scared. So here are my questions and I hope a senior representative can help me with these questions:

1. Do all purchases for runes and rune pages, to get reimbursements for BE, count for only this season or any season you purchased them? 1a. Does rune combiner runes back in Season 4 or 5 (I miss rune combiner :( ) count for reimbursements?
2. Does your new level system, time in game, mastery, or anything else effect the amount of BE or XP you get after any game? (Whats the calculation?)
3. Does playing different maps still have different ratios? I.e. Twisted Treeline beginner a.i. at 10 min is less BE than Summoners Rift beginner a.i. at 10 min (same for XP)
4. Is the minimum game time requirement still at 7 minutes to earn BE and XP? (Season 4 I did a 3 minute game on TT begin a.i., it was EPIC!)
5. With the new daily missions taking over "first day of the win", is there a time cap, time requirement, or time limits in place for this? 6.Will it be harder for players playing once a day to get BE instead of playing more often in this upcoming season?

I might have more questions, but I think that's all of them for now. Again thank you for your time to read this. And GLHF