1. No. That is only used to estimate the ETA, in the beginning (when you join the project). Later, more complex ways are used, which take into account your real activity, so that number has not much importance. An example of secondary effect, if your ETA is long, you may not get low assignments. You run the computer how many hours per day you like, nobody is forcing you to do something out of normal, etc.
2. No. We do this for fun, and every contribution is welcomed. 101 miles per hour is better than 100 miles per hour. Nobody will blame you for your voluntary time and electricity money, no matter how small this contribution is.
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