It is currently 3 x 2 week blocks but I've seen proposals to increase it to 4 x 2 week blocks. The new block would be CMD trg which is required for reservists to augment regular force deployed operations. Currently, we are pulling reservists out of TMSBP and sending them last second after they are already slotted for tour.
(Expect an additional 2 weeks in the Sect 2ic crse on the same theme)