Implementation times for HR software vary widely depending on the complexity of the software and the size of the organization. On average, simple systems can be set up in a few weeks, while more comprehensive solutions may take several months to fully implement. The key factors affecting this timeline include the scope of the project, data migration needs, customization requirements, and the readiness of the organization's infrastructure and staff.
To gain a better sense of your own implementation needs, have a read through this article on HR software implementation or these tips explaining how to tell if you're ready for new HR technology.