how many months it will take the CRO to recruit / enroll all subjects into the clinical trial. The Sponsor provides the # of subjects and the CRO provides the # of sites and # of months that they need to enroll these subjects.
Patient recruitment months (provided by Operations at Vial), as well as treatment and follow up months (provided by Sponsor in synopsis) and # of sites (provided by Operations at Vial) are the cost drivers for preparing your budget.
The most important aspect of a Clinical Trial is how and in how much time you will enroll the subjects.