Geno, they kind of covered that. During the advanced erosion section, he gets buried for a great deal of time, not to mention the second ice age that covers him in ice for a time.
I thought the movie was okay. They had some great scenery in it, and the acceleration of time was handled pretty well (with a few minor sections that I have quibbles about). Unfortunately, I think they killed the movie that this could have been in the editing room, or they should have shot more movie.
*Spoilers below*
They didn't set up the inevitablility of his fiancees death well enough to propel the rest of the movie. Then, after his two trips back, he almost forgets why he's even travelling (and don't forget that we're only talking about a matter of days in his time). More setup and maybe some more exploration on his quest to find out why he can't save his fiancee would have made this a much better movie.
A little to short, but the Morlocks were great, and the Eloi village was excellent. Pearce also does a fair job.