Sp times combined will be tough to beat in an ER marathon.
dm1 : pfff. dm2 : no gain from marathon. must do optimum :-) dm3 : start with RL. save 3 seconds dm4 : save .5 seconds top. dm5 : hmm. dunno. doubt you could save more than 2 dm6. RJ start, save 1 second.
So assume you lose 3 seconds on dm1 you have to do optimum times to be 3 seconds faster. :-)