I you want to sand it for 3+ hours with a finer grit, feel free. 60 is just right for taking off a thick coat of satin I prefer about an hour or so with 60. I just did my jazz neck and had no problems. It is amazingly smooth. 60 strips the satin fast. You obviously have to use finer pads etc after the 60 to buff 'n smooth it out.
"Hey, Where'd my neck go?"