We have three ceiling fans in our home and they all were quite dusty after running all summer. Look closely if you dare.
It really didn't take much time at all, to wipe each blade (sides, top and bottom) and free them of dust with my microfiber cloth. I also ran a vacuum underneath each one to suck up the dust that fell to the ground.
A short task. About five minutes at the most for each fan. Twice a year.
Do you have ceiling fans? How often do you dust yours?