We believe in cleanliness so we definitely would like to encourage our customers to wash or change your bed linen weekly. Our recommendation is to have your silk pillowcase(s) washed weekly as well.
Silk pillowcases are hypo-allergenic, can be anti-aging, anti-acne, anti-hair breakage and anti-crease. That's a lot of benefits! Even with all of the benefits listed, silk pillowcases are an investment that will last you between 8-12 months.
If you follow the washing instructions, you should be able to keep yours for the latter half of the projection.