You can expect to spend six months to two years working on a comprehensive review. Conversely, non-comprehensive (narrative) reviews typically take about a month. Rapid reviews also take less time -- about two months -- but require justification for choosing that methodology (e.g., examining an emerging technology or responding to a public health crisis).
The timeline for the literature search varies by project as some research questions take more time than others. Generally, once you've met with us, you can expect us to finish the search in about three weeks for comprehensive reviews and less time for narrative reviews.
Timeline for a systematic review from the Cochrane Collaboration
