At one point in college, I was using an old Thinkpad x41 tablet and wanted to mess around with gnuradio. I wanted it on my tablet laptop since I had that on me most hours of the day. Compiling gnuradio took several hours. I was running arch so I want unfamiliar with compile times for things I grabbed from the AUR but it was atrocious. I started it in my first class of the day and would just throw my laptop in my bag while it was still compiling and walk quickly to my next class so I could grab a power outlet before Pentium M sucked up all the battery.