I would have a tendency to agree with you about the 2 more days, however, you could also look at it like this.
2 days out of a year comes out to roughly .55% of the year, 2 days not seem like very much.
2 days out of 15 equates to appx. 13.3% of the overall time, which is quite a difference.
So while 2 days doesn't seem to be that much of a difference, it could have been a 13.3% increase in overall game prep/practice. Now, spread out over the duration of 3 games, I'm not sure how much of a difference it actually makes. Just throwing it out from a numbers perspective.
P.S. I've never claimed to be a math wizard so please be gentle if my calculations are "a little off"