These organisms are classified as a kingdom, Fungi, which is separate from the other eukaryotic life kingdoms of plants and animals. A characteristic that places fungi in a different kingdom from plants, bacteria, and some protists is chitin in their cell walls.
If you will reach full retirement age in 2015, you may earn up to $3,490 per month without losing any of your benefits. But for every $3 you earn over that amount in any month, you will lose $1 in Social Security benefits.
I do not believe it's a question of how many hours, but how much you can earn without it affecting your social security. I believe the the figure at present is $14,999.00. Any more than that can affect your social security. However, this is only for those who have retired early (starting at age 62).