Searching of missing persons, classmates, frauds, scams and debtors. These requests we also meet very often in our work. To find somebody we sometimes need only 2-3 days, but some searching can be 1-2 months long.
Detective follow the interesting person to collect his (or her) daily route, addresses, contacts, meetings, etc. Photo and video evidences also include in our report. Surveillance often use to find someone, to find out intersting facts, to find out some details about activity of company or individual and etc.
Period - client pays for every hour of surveillance. How much time we need exactly - we'll understand after private conversation with client