"I mean rappin' to me is easy, it's something you can do over a week"

Ice T is suggesting that rapping is a simple ability to find out. He indicates that it is something that can be done over a period of time, rather than something that needs a lot of effort or time to master. He is recommending that anyone can learn to rap, and that it is not a hard skill to acquire. He is also indicating that it is something that can be performed in a relatively brief amount of time, such as a week. This recommends that rapping is an accessible skill that anyone can find out, which it does not require a lot of time or effort to become skilled. Ice T's quote is a pointer that anyone can find out to rap, which it is not an impossible ability to master.