DfI/2019-0389: FOI Request for information relating to Fon-a-cab and Valuecabs booking records for the last 6 months

Under the Freedom of Information Act request a full list of all the taxi/job fares recorded as picked up by Fon-a-cab and Valuecabs operators in Belfast within the permitted weekend hours when their drivers have acted on or as a sole trader basis under the banner of their employer for the past 6 months. Which is the legal minimum time that records need to be held?