Registrar and transfer agents (RTAs) process share transfer requests within 15-30 days if documents are in order. If an RTA does not respond within 30-35 days, investors can contact them to check on the status of a share transfer request. RTAs must be authorized by SEBI and comply with various guidelines regarding qualifications, infrastructure, capital adequacy, and more. SEBI conducts inspections and can suspend or cancel an RTA's authorization for any violations.