Dust!!!!! Golly how I hate dust.
It was the Kings Birthday Long Weekend here in Australia and I've just finished (nearly) my biyearly dusting and wipe down of my steam room, every engine, every accessory and all the shelving, literally every surface.
Started on Thursday morning and its Tuesday here now and I should be (hopefully) 'done & dusted' this afternoon, so that's a solid 6 days of work.
What's your battle against dust like for your collection? Do you have the odd skirmish here or there or do you do like what I just did ..... a battle to the finish when it needs it?
Looking in my logbook, its roughly (give or take a month) every two years for me.