I have done most of the tier 8 premium marathons and I think this is the best designed one yet. In the past the targets were enormous and required consistent hours and hours of grind each and every day. Every time I have done one previously I have been burnt out and quit playing for 2 or 3 months afterwards.
This mission is different. It has varied goals each day. Some are harder than others, but none have been impossible (I have a job and family and I still have managed to do it - and I have a rule that I don't play when the kids are awake). The missions appear to have been timed according to the day of the week with easier to complete ones on week days.
And to top it off it is only 2 weeks long as opposed to a month.
And the 2 extra days and tokens mean if IRL gets in the way I don't lose out on the tank.
All in all I think WGing have done a really good job with this marathon mission. Well played GG.