People who have 50k+ reputation: how many hours do you spend answering questions on Stack Overflow and how long did it take you to pass the 50k mark.
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I don't think the data dump provides enough information to see when someone hit 50k, but you can see the average reputation gain per day for 50k users to see how high it is. They don't seem to be incredibly high except for the top users, most of them have just been SO members for 500+ days
I don't actually dedicate time to answer questions. I leave the site open on my secondary monitor when I'm using only the main one, and when I see something interesting I pop in to contribute1. Nevertheless, I can easily estimate that this takes away about 2 hours of productivity every day, but if I consider what I have learnt and how answering questions helped me sharpen my skills, I believe I had that time returned back with interest.
1 In addition, I have recently been using the StackGuru bot to get a notification on gtalk whenever a question is posted on a tag that I follow. This app is great!