Every 4 hours during continual usage.
8
A hamster cage should be cleaned weekly.
It has to be cleaned every so often, mainly if you can see that it is dirty than you should clean it. And it really should be cleaned every 4-5 weeks.
There are many factors to consider when shopping for a mixer. There are things like the size and type of mixer you are wanting. There is also choices as to whether you are going to be baking allot a home mixer will do fine, but if you are going to be baking more often or baking greater quantities you might want to consider a commercial grade mixer.
A horses stall should be cleaned every day.
It must be cleaned daily.
after the exam is finished but sometimes its cleaned after the end of all the exams
This trim kit is fairly resistant to average scuff marks and should not have to be cleaned exceedingly often.
Whenever necessary. Often they're cleaned on Friday early afternoon and on Saturday night.
Draperies should generally be cleaned one or two times a year.
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While in college I work in a place where I had to make milkshakes and each time I used it I ran hot water in the metal cup before using it again. You just put it up into the machine like you do for a milkshake but with water and not milk. This takes the leftover milk off the machine. Every night I emptied and cleaned the soft serve machine. I would take it apart, wash the parts, lay them out on a clean towel and cover them. The ice cream/milkshake mix would be emptied into a bucket to be reused the next day and stored in the walk in box overnight. This was done before cleaning.
It is not known. Roman baths were cleaned as needed. They were flushed by using the water supplied by the aqueducts.