Ideally, every day. The coffee oils go rancid quickly unless the grinder is kept impeccably clean. In the worst case - a shared machine in an office where nobody wants to clean it - don't let it go longer than a week.
The best coffee grinder to use for making delicious espresso would be a conical burr coffee grinder. Conventional blade grinders offer poor consistency in the chop and often expose the beans to heat during the grinding process. High quality conical burr grinders give a uniform fine chop and have a heat reduction motor to reduce heat exposure.
A hamster cage should be cleaned weekly.
You should clean your coffee grinder after every use to prevent the buildup of oils and residue that can affect the flavor of your coffee.
A horses stall should be cleaned every day.
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.
every day
It must be cleaned daily.
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Draperies should generally be cleaned one or two times a year.
Every day
A stall should be cleaned twice a day or more and it has the most manure right after feeding
Gutters should be cleaned at least twice a year to prevent damage to windows.