UCI CYCLING REGULATIONS  Grand tours  Rest days  59  ROAD RACES  E170421  2.6.009 With a special waiver from the executive committee or, for UCI WorldTour events, from  the Professional Cycling Council, organisers may be authorised to include:  2.6.010 The number of half-stages is limited as follows (without taking account of the prologue) :  2.6.011 The maximum length of grand tours is 3500 km.  2.6.012  In events with more than 10 days of competition, at least one rest day must be allowed  for and fall after at least 5 days of racing.  - a maximum of two stages of over 240 km in races of 10 days and more for elite  men;  - a single stage of no more than 230 km in races for under-23 men;  - in elite women's races one stage only of 150 km maximum;  - in junior men's races one stage only of 130 km maximum.  (text modified on 1.01.02; 1.01.05; 1.01.08).  Number of half-stages authorised  Races of fewer than  Races of 6 days or  6 days  more  UCI WorldTour  Half-stages forbidden  Men Elite 2  4  Under 23 2  4  Women Elite 2  half-stages forbidden  Junior  2  half-stages forbidden  (text modified on 1.01.01; 1.01.06; 26.06.07; 1.01.09).  (text modified on 1.01.02; 1.01.08).  In the major tours two rest days are obligatory and must be distributed evenly.  Unless the UCI makes a derogation to that effect, a transfer cannot be considered as a  rest day.  (text modified on 1.01.02; 1.10.10). 