Well, I do understand he based the 10 mins based on the average block time, but this isn't really what I asked, Stavroski was asking about "this round of work", the hash which your miner tries to "brute force" isn't static throughout the block-time aka 10 mins, so whenever there is the slightest change in any of the block components, for example, a new transaction is added/removed the whole "round of work" is reset, and if Stavroski is asking about how close was he to solving a block based on the difficulty target at that given time (which is also a possibility) then this change would only happen once every 2 weeks (2016 blocks), but either way, 10 mins has really nothing to do with the stats of your miner, unless I am missing something.