How often do you wash your sheets?

[Oxylepy]

I live at an apartment and we have laundry facilities but its 1.25 to dry and 1.50 to wash so I wash my sheets maybe every 2 months?

..................... It costs me 5 dollars to wash my sheets. Thats just the sheets and pillow case... thats all.... Thats half the cost of typical laundry for me and means I have to get another roll of quarters... Come on man.