Even with 4 Xmas Markets, the split with the cooldown doesn't realistically allow me to manage 2 fully upgraded markets. The split being 5 hours 14 mins means even I start one at 6.30am and the 2nd at 11.44am, by the time i come to buff the 2nd market in the evening it will be way past 11pm... doesn't leave much time to sleep does it?
Having a 5th would reduce the cooldown so I could realistically run the two at decent times of the day..