Generally reserved days are scheduled on the next day of the actual match day in every tournaments.
From IPL's match playing conditions:
###50. IPL 2014 PLAYOFF MATCHES
<!>5. A reserve day is available for three of the four playoff matches, as follows:
a. Qualifier 1 – reserve day: Wednesday 28 May at Eden Gardens, Kolkata starting at 4pm
b. Eliminator – reserve day: Thursday 29 May at CCI, Mumbai starting at 8pm
c. Qualifier 2 – no reserve day
d. Final – reserve day: Monday 2 June at M. Chinnaswamy stadium, Bengaluru starting at 8pm