The amount of time in between sharpenings will depend on the complexity and frequency of use. If the knives are used heavily it will need sharpened more frequently. If the knife has trouble cutting through the appropriate item then it will need sharpened. Most knifes in a kitchen where they are used frequently will need sharpened every 2-3 months.
Complete sets often come with 10 or more. However, I would suggest 1 paring knife, 1 serrated knife, 2 sizes of utility knife, 1 butcher knife and a cleaver.
A snow plow blade should be sharpened after every 50-60 hours of use, or whenever you notice reduced cutting efficiency. Regular sharpening helps maintain the effectiveness of the blade in clearing snow.
No how often they will need sharpened will depend on how much you use them and what on.
Every day
Changing your kitchen plumbing is not a safety issue. Your pumbing should be changed only if they need it.
You should only sharpen your knives once per year, because after a while of continuous sharpening your knive blade will become thin.
on a regular basis
Kitchen hood vent cleaning should be performed at least every six months to ensure optimal performance and safety in the kitchen.
Normally minimum wage if they are lucky, Kitchen porter jobs should be seen as way into a commercial kitchen, the jobs are unskilled and often dirty, but they give you an insight in the workings of a kitchen.
u speaking of skates? 6 ,months
Because using it produces wear, which makes it become dull.
I personally love to have a kitchen roll holder. I would recommend getting one if you have them often enough.