MARS II III IV Reserves Distance Learning

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The info I have about MARS II III and IV are as follows:
-MARS 2 is anywhere from 47 – 54 days depending on whether it is the Reg force or Reserve Course (reserve course is shorter due to DL which is completed in house)
-MARS 3 is approx 117 days (unsure of distance learning?)
-MARS 4 is approx 117 – 144 again reserve vs reg force coursing

Can anyone tell me how the distance learning portion of any of these crses work? Does these number of days include the distance learning? How many class A days for each of the DL portions?