http://www.uci.ch/mm/Document/News/R...NG_English.PDF
looks like 9 months.
ARTICLE 1.3.007
“Bicycles and their accessories shall be of a type that is sold for use by anyone practising cycling as a sport. As a result of production imperatives (time constraints), an exception may be requested from the UCI for equipment that is a final product and that will be marketed in the nine months after its first use in competition. The manufacturer must however publish information on the equipment in question in advance and announce the date of its market launch. The use of equipment designed especially for the attainment of a particular performance (record or other) shall be not authorised.”
The bicycle must be accessible to all participants. All the components of the bicycle must be available commercially (i.e. available on the market or sold directly by the manufacturer) at the latest nine months after their first use in competition. To implement this nine-month period, the manufacturer must publicly announce that the product in question is being used in competition and when it will be available for sale. In all cases the product must be a finished product in the condition that it will be marketed. The testing of a prototype in competition is prohibited.
Thus, it is not allowed to use equipment in competition that is not either available on the market or previously communicated by the manufacturer (with a nine months period for the marketing).
Prototypes and the use of equipment specially designed for a particular athlete, event or performance are prohibited. "Specially designed" means a bicycle with a technical added value when compared with other equipment.
No minimum production quantity or minimum price is defined for either bicycles or any component parts.