RuneScape total play time: I think I had around 400 days on my banned main.
My second account has 190 days and third account 130 days. My secondary accounts are primarily botted though, not sure how many of the days I actually played on them.
Longest RuneScape session & why: Not sure on my longest runescape session but I know I've played 16+ hours many times. (Woke up, logged onto rs, logged out to go to sleep)