It's funny when you plan out a backpacking trip, you search the internet for details to make an overall plan and trip itinerary. You get your daily mileage and ascent all scheduled out, and you start to think that only bad weather can throw a wrench in your plan.  However, over time, I've learned that I should always anticipate about +/- 5 extra miles to what I read online. That was definitely the case with this trail from Lyell Canyon to Devil's Postpile. All my research (reading online trip reports) led me to believe this trail would be about 31 miles and only 4,100 feet of total gain, and so that seemed like an easy 10 miles per day trip. We were slightly surprised when we found that the trail was actually about 38 miles and 5,000' of gain, and had to make up some extra miles in day 2 and day 3. It still was an excellent trip, and very doable in 3 days.