My experience with chipping is somewhat different than mikester. I thin my stands and drag all the downed pines to many piles. THEN - I begin chipping. I will chip for ten to twelve hours every day. Take a break every hour or so and rehydrate. Chipping will be all done in less than a week. The entire process - less than ten days.
Some times are easier than others. My son and his friend will, occasionally, drop by and give a hand.
This is how I thin my stands and chip 800 to 1000, or more, small pines.