Final answer:
Shears should be sharpened every 4-6 months for frequent use, and once a year for less frequent use. Kitchen shears should be sharpened every 3-4 months due to more frequent use.
Step-by-step explanation:
When it comes to sharpening shears, the frequency depends on how often you use them and the type of shears you have. Generally, it is recommended to sharpen fabric shears every 4-6 months if you use them frequently. However, if you use them less often, you can do it once a year. On the other hand, kitchen shears should be sharpened every 3-4 months as they are used more frequently and tend to dull more quickly.