Investing, Stocks, Mutual Funds

We are trying to plan for next year when we plan to implement a new ERP program. Can anyone tell me how long Erp Implementation usually takes? We really want to minimize any disruption that will come along with implementation, so we are going to get some help with maintenance. We are mainly interested in the human resources application of the software so that we can better deal with all the applicants and their resumes as well as all of the employee issues that come up. We are still trying to figure out which ERP software would be the best for us.