I tested it today, 16/8/1 – even playing comfortably (not in blitz mode), there's still a lot of time left. I don't think this is the best option after all.
All the accumulated time will be spent when cross-battles and castle captures begin... and, as I said before, after the opponent's turn, you'll have to reorient yourself! There should be a free minute to review the opponent's turn.
And if the defense is weak, the game turns into a nightmare where there's nothing to even fight against:)
A Boombox with strong defense is very interesting to play!
