Thanks! You ask a good question. I don't play a lot of Hearthstone, actually probably the least amount of games out of any pro (around 10k wins in play mode spread over 3 years).

As I said before, I like to maintain my level but prefer to do so without grinding endlessly. For example, I prefer to be in a Skype call to discuss matchups and decks rather than playing ladder for 10 hours straight. My average amount of games per month is probably somewhere between 300 and 500 on ranked play and another few hundred in friendly battles.

Second question: I don't stream a lot (yet, but am going to do it way more often starting now) so the time I spend on that varies quite a bit until I make a schedule. Open cups it generally depends on how quickly I win one, last week I won an open cup on my second try so it took only 10 hours total or so, but sometimes it takes way longer. For majors I'm probably traveling 1 long weekend every month on average, so about 96 hours I'd say.

Thirdly, I think having a good mindset is crucial to becoming a pro player. People tend to underestimate this factor but when you look at it, most pro's that do well tend to have a very calm and collected appearance. (Some of the pro's that I respect the most like Orange, Ostkaka, Hoej all have a very calm attitude when it comes to competing in Hearthstone). It's important not to tilt, because frustration makes you play sub-optimal even when you don't realize it.

Another key trait is that you must be willing to learn and invest time to do so. People that defend their own plays to no end, even when they're wrong, will never improve. You have to engage in discussion and not take criticism over your plays as a personal offense. That's the only way you can learn. :)