Depending on the texture of the fur and how much the coat mats you would be grooming once a day or a few times a week. The silkier the coat, the less grooming but on a longhair its at least 2-3 times a week. If the coat is like a persian or mats easily - you need to comb every day.
I have shorthair cats - they get petted mainly for grooming but will run the flea comb thru the coat a few times a month - a little more often when shedding season. Ling needs it more then Charlie, as his coat is fine and rarely needs any kind of grooming.
The Maine Coon and Norwegians get combed 2-3 times a week. The Persian, daily. As for bathing - the Persian gets bathed at least twice a month and the other 3 once a month unless it's show month.
My 3 are all short haired....but I do try to brush them a bit everyday. They LOVE it....and not only do they not get hairballs very often, but it saves there being so much cat hair on everything they lay on in the house!
Linda
All three of my cats have short hair, but I have to comb then everyday.
Especially Elliott, he has very thick fur and if I didn't comb him daily my house would be covered in white hair.
For me a fine toothed comb seems to work better than a brush.