I always like doing many things, so I think one gets used to it. But I think that, when you do things knowing that you have little time for it, you are much more productive. Some days when I have the whole evening free I end up doing much less than when I have only 2 hours.
Having said that, there are some tricks, like having activities at the end or at the beginning of the day, so that they do not cut your day in 2 and do not distract you too much.
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