Assuming no Cardinals die before the Conclave, here is some data:
- 117 Cardinal Electors (of 209 living)
- 78 votes are required for election (2/3rds) [UDG #62]
- 51 of the 117 electors were named by Pope John Paul II, the remaining 66 were named by Pope Benedict XVI
- of the 10 Cardinal-Bishops, only 4 are electors:
- Giovanni Battista Cardinal Re, of Sabina-Poggio Mirteto
- Tarcisio Pietro Evasio Cardinal Bertone, S.D.B, of Frascati, Secretary of State, Chamberlain (Camerlengo)
- Antonios Cardinal Naguib, Coptic Patriarch Emeritus
- Béchara Boutros Cardinal Raï, O.M.M., Maronite Patriarch
I suspect that it will begin on either Saturday 16 March or Monday 18 March.
The length, of course, is not knowable. Recent Conclaves have tended to be fairly short - usually a few days.
That would suggest that a new Pope is possible by the Solemnity of St. Joseph (19 March), likely before Palm Sunday (24 March), and almost certainly by Easter (31 March).