Virtualize my work machine.
Some experiments take some time. Others take much longer. Although they are not so complicated. Data-intensive operations take a long time. My experiment was to visualize my working machine. It's very good machine (gaming 14" MSI that I adore) but still it can be better :) In azure in the MSDN subscription I have money to spent so I can create quite heavy loaded machine with not so big price - of course if I don't use it all the time. And working machine should be (at least in theory) working only 8 h / 20 days a month.