Allow me to ramble with a bunch of opinions...

Compart1 has it right...practice is the homework. Ya' go through the lesson and practice until ya' get it right. At least, that's the way I think it should be done. A rule of thumb I picked up 'somewhere' is; practice until you can play what you're working on three times in a row, at speed, with no mistakes. If you really want to ensure that you've got it down pat apply the rule of thumb without looking at the fretboard. Then, however quick that is, move on to the next lesson. But...

That may be/can be overly strict. IMO, it's not that some lessons are less important and deserving of solid performance, it's that somewhere down the line one will run into something that one just can't 'get.' At some point the decision has to be made to move on and maybe come back later. Figuring out if you're at that point can be difficult...I personally hate to give up and have spent a lot of time on individual lessons, riffs, awkward chords...whatever. But once or twice I 'moved on.'

Again IMO, one thing is for sure. 'Things' will slow down as you progress through the lessons because the lessons will become more challenging. I don't think the schedule of "a chapter a night" is going to hold. Or, to put it another way, there's no way I can do a chapter a night. Which leads to the subject of how to practice and how to practice correctly/efficiently. A "little each evening" is good, a set amount of time is far better. How much depends on the individual's situation and motivation (read; prioritization). My strongly held personal opinion is the bare minimum is an half-hour, five days a week...but one should really find a way to practice [U]much[/U] more than that...say it altogether now...IMO. :D

A lot of my opinions here -- I'd like to see others'.