Once you block in FDP ends, if there is nothing on your schedule at block in than they can't add anything else unless your get 10 hours of rest.
117.21 Reserve status.
(a) Unless specifically designated as airport/standby or short-call reserve by the certificate holder, all reserve is considered long-call reserve.
(b) Any reserve that meets the definition of airport/standby reserve must be designated as airport/standby reserve. For airport/standby reserve, all time spent in a reserve status is part of the flightcrew member?s flight duty period.
(c) For short call reserve,
(1) The reserve availability period may not exceed 14 hours.
(2) For a flightcrew member who has completed a reserve availability period, no certificate holder may schedule and no flightcrew member may accept an assignment of a reserve availability period unless the flightcrew member receives the required rest in ? 117.25(e).
(3) For an unaugmented operation, the total number of hours a flightcrew member may spend in a flight duty period and a reserve availability period may not exceed the lesser of the maximum applicable flight duty period in Table B of this part plus 4 hours, or 16 hours, as measured from the beginning of the reserve availability period.
(4) For an augmented operation, the total number of hours a flightcrew member may spend in a flight duty period and a reserve availability period may not exceed the flight duty period in Table C of this part plus 4 hours, as measured from the beginning of the reserve availability period.
(d) For long call reserve, if a certificate holder contacts a flightcrew member to assign him or her to a flight duty period that will begin before and operate into the flightcrew member?s window of circadian low, the flightcrew member must receive a 12 hour notice of report time from the certificate holder.
(e) A certificate holder may shift a reserve flightcrew member?s reserve status from long-call to short-call only if the flightcrew member receives a rest period as provided in ? 117.25(e).