A systematic review can take at least a year to complete. The PredicTER tool will give you a sense of the time requirements for various tasks involved in reviewing evidence.
if you are not working in a team, or do not have a significant amount of time to complete your review, you can still apply the methods used in systematic reviews to your own research project. As one of the main goals of a systematic review is to try and eliminate potential bias, working independently can be viewed negatively. If you must work independently, you should identify this limitation at the time of publication.