Best source of information for all NCAA rules related questions is the rule book itself
http://www.ncaapublications.com/productdownloads/D111.pdf:
13.6.2.6 Number of Official Visits—Institutional Limitation.
The total number of official visits a memberinstitution may provide prospective student-athletes in the following sports on an annual basis (August 1through July 31) shall be limited to: (Revised: 11/12/97)
(a) Football—56.
(Revised: 1/10/91 effective 8/1/91, 1/11/94 effective 8/1/94)
(b) Basketball—12.
(Revised: 1/11/89, 1/10/91 effective 8/1/91, 1/11/94 effective 8/1/94)
(c) Baseball—25.
(Adopted: 1/12/99 effective 8/1/99)
13.6.2.6.1 Exception—National Service Academies—Football, Basketball and Baseball.
Thenational service academies may provide 70 official visits in football, 56 of which may be provided prior tothe initial National Letter of Intent signing date, 15 official visits in basketball, 12 of which may be providedprior to the initial National Letter of Intent signing date and 31 official visits in baseball, 25 of which maybe provided prior to the National Letter of Intent signing date. (Adopted: 1/10/95, Revised: 1/14/97 effective8/1/97, 4/25/02 effective 8/1/02)
13.6.2.6.2 Unused Visits—Football. [FBS/FCS]
In football, an institution may retain a maximum ofsix unused visits from the previous academic year. Such visits may be used only during the following academicyear. (Adopted: 1/14/97 effective 8/1/97, Revised: 11/1/01 effective 8/1/02, 12/15/06)
13.6.2.6.3 Exception—Institution That Does Not Subscribe to the National Letter of Intent.
Amember institution that does not subscribe to the National Letter of Intent may provide 70 official visits infootball, 56 of which may be provided prior to the initial National Letter of Intent signing date. (Adopted:1/11/94 effective 8/1/94)
13.6.2.6.4 Written Record Required.
The institution must maintain a written record of the paid visitsof its football, basketball and baseball prospective student-athletes. (Revised: 1/12/99 effective 8/1/99)
13.6.2.6.5 Multiple-Sport Prospective Student-Athletes.
A prospective student-athlete in footballand one or more other sports (including basketball or baseball) shall be counted against the visit limitationin football. A prospective student-athlete in basketball and one or more other sports (other than football)shall be counted against the visit limitation in basketball. A prospective student-athlete in baseball and oneor more other sports (other than football or basketball) shall be counted against the visit limitation in baseball.
(Revised: 1/12/99 effective 8/1/99)
13.6.2.6.6 Waiver of Institutional Limitation—Extraordinary Personnel Losses.
The LegislativeCouncil Subcommittee for Legislative Relief may grant a waiver of the limit on paid visits for an institutionthat has suffered extraordinary personnel losses to its football, basketball or baseball team from an accidentor illness of a disastrous nature. (Revised: 1/12/99 effective 8/1/99, 11/1/07 effective 8/1/08)
13.6.2.6.7 Exception—Waiver of Institutional Limitation—Head Coaching Change.
In baseball,basketball and football, an institution may provide additional official visits (up to 25 percent of thelimitation for the particular sport) after a new head coach is hired, provided the previous head coach used
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75 percent or more of the official visits permitted for that academic year. The Legislative Council Subcommitteefor Legislative Relief may grant a waiver of the limit on paid visits for an institution that has made ahead coaching change in football, basketball or baseball to provide additional paid visits in excess of 25 percentof the limitation for the particular sport after the institution has used all or nearly all of the permittedofficial visits in that sport. Such a waiver request shall be submitted by the institution’s director of athletics.If the waiver request is granted, the subcommittee shall establish an appropriate additional number of visits.
(Adopted: 1/11/94 effective 8/1/94, Revised: 1/12/99 effective 8/1/99, 4/29/04, 11/1/07 effective 8/1/08)
13.6.2.6.8 Effect of Violation.
A violation of Bylaw 13.6.2.6 shall be considered an institutional violationper Constitution 2.8.1; however, the prospective student-athlete’s eligibility shall not be affected.
(Adopted: 10/29/09)