Ultimately, lengths don't matter as long as the songs are great. I'd prefer they throw in more short songs, but I have absolutely no problem with the longer ones as long as they try to keep it fresh. Ultimately I'd like 4 songs about 5-and-a-half minutes or less, 2 songs in the 6-7 range, 2 songs in the 7-8 range, and one full-blown epic. I could really go for a 10+ minute track, provided they're gonna pick up the pace with the rest of the disc.
But yeah, ultimately it doesn't matter that much to me.