This is highly dependent on the size of the organization, type, champion, etc. What group are you selling to (security? hr? finance?). What is the deal size? (10k? 50k? 100k? $1m+?). how long does the POC take to convert (POC is not a sale, even if paid). who are you selling to? (fortune 20? fortune 50? fortune 500? mid-market? smb?) and other factors
MANY variables but 3-18 months. Deals with health systems can take 12-24 months easily.