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How do you keep up
It's currently about 2 hours per week (usually on one weekday night) to update the data. This will probably rise to 3 when all leagues have started playing and 5 when there are midweek matches. Given that I was spending 1 to 2 last season just doing corners and shots data for England/Scotland I don't think this is too bad. However, I wish my programming skills were better so I could fully automate the data collection process. At the moment it's a jumble of macros run in Excel after a series of copy/pastes.
I don't use the majority of data for betting systems at the moment, particularly for the European leagues which I know less about, but I'm hoping that in the future I will stumble upon the "winning system" and then I will have the data to test it. You can never have enough data in my opinion.