I like the idea of two hour workshops - mostly because my brain always gets fried at the end of the second hour and anything after that just confuses what I thought I'd learnt (admittedly I'm easily confused).
I don't think an hour is long enough - especially as I strongly believe workshops should be far more technical than classes. I also like the idea of tacking a freestyle session on to the end of a workshop. Whenever this is done, it gives you a chance to practice what you've learnt.
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