how many hours per day do masters play and study

"How do you train chess each day? How many hours do you spend on chess? …" - IM Georgios Souleidis (2011)
"I don't actually train every day. ... Especially now more so than in the past there are long periods when I do not play. ... When I have these really long periods, I won't study every day. Generally about two, two and a half weeks before a tournament I start studying, probably about 4 to 5 hours per day." - GM Hikaru Nakamura (2011)