It would depend more on how many miles you go before it needs a quart of oil. A healthy engine should go between oil changes without adding oil.
It should be done once a month
You should wash your shutters at least once a month.
You should water it every month. Also water is directly on the soil not the plant.
about every month or every other month.
2 pints make a quart.
once a month
I need someone to clean my house twice a month
should be alittle more than a half of a quart
Most dehumidifiers only need to be disinfected once a month or so.
On average about once A month.
one time a month
You should send flowers when you need to convay a message. Flowers should be the reinforcement to your sentiments when you can't express them enough - wether it's for a birthday, anniversary, or the passing of a love one. There is no limit to how often you can send flowers