You're in the US, as according to your Location. Is it hot there?
Just joking - the quicker, the better. Decomposition in a humid climate at 90+ degrees happens pretty quickly. If you're gonna do it, you can't wait a week. I'd say 2-3 days max. I haven't farmed cattle in 10 years, but I know the worst stench in the world is a steer laying in a ditch face down that you pull out after two weeks of being dead.
Good Luck! Hahaha.