No. There are no fixed limits for working with an IT consultant. Depending on your requirements, you can hire consultants for a day or for entire projects. Some companies also hire IT consultants for the long-term to constantly assist day to day operations. These consultants can also work in collaboration with existing IT staff. Many companies also prefer to hire IT consultants to accomplish complex tasks that cannot be completed by internal staff, especially if it has to be completed within strict deadlines.