For UK contracts:
SFO- >2500 factored hours and full ATPL
(0.8 x your total hours for short haul jet FO)
(0.9x your total hours for short jet CPT)
(0.6x your total hours for long haul FO)
(0.7 x total hours for long haul CPT)
(0.7 x your total hours for Airline turbine FO)
(0.8 x your total hours for airline turbine CPT)
FO- >1250 factored hours
Upgrade to FO after a minimum of 24 months operating as FO.
No mention of number of landings in the calculation just whether you were P1 or P2. Hope that answers your question.