I put mine on my stand and do a fairly thorough cleaning. Wipe off all the frame, making sure to get into the tight spots. I wipe of the rims. Do a cleaning of the chain (if I didn’t do it late last year, otherwise will wipe it down). Then I oil everything that needs it. Lastly, I check the batteries in my lights.
All totaled, it takes me about 30-45 minutes.
This year, I have two fresh tires to put on. (Reminds me, I need to get new tubes.)
Now that you’ve got me thinking about it, this weekend seems as good as any to get the bike ready to go.