I don't believe it listed a month. Far as the quad track goes it might have less compaction, would have to know the amount of contact area and weight to be sure. 

Have seen more than one study though that says if a 4-wd is equipped with 8 radials and are properly inflated that there is less compaction than what the cat challengers have. Like I said would have to compare contact Areas between the two. However, our MF is paid for, and with corn under $2 and fuel over $2 I can live with the MF. Besides on most of the ground we use it on if its wet enought to cause major compaction then its to wet to work anyways, and then we get one of the White 4-wd on the job because of weight difference. Really like to see dust rising when using the MF.