You know, I like these 20 minute challenges. No hassle, no stress... except for the last minute or two when I'm not finished and the clock continues mercilessly ticking away :-)
There's such a freedom in doing these. I keep in mind that it's the process that matters here, not the end product. This allows me to have fun and learn without feeling like the result has to be on a certain level. With TMC's success is the doing, not the end result.