How much time do I have to think a job offer over before accepting? [PA]

I might be offered a new role, either tomorrow or Friday. I am excited about the possibility after being unemployed for the better part of a year, but I do need some time to consider. The reason being because another company may also be extending an offer to me , as well. To be honest, I am more excited about the second company. I spoke to the recruiter today for that company, and he told me he is just waiting on finalization items from the manager who may be out of office for the rest of the week. He said if he does not follow up with me by end of week, that he will sometime next week.