For a 10gal tun use 1.5qts per gallon at 167F, bringing your mash to about 152-153F for 60 min, and decoct 8.75qts and boil for 20 minutes. Add this back in to bring your mash to 168F for mash out. Sparge at 170F to your boil volume. This will also darken your beer a little bit.
Otherwise, if you're more worried about boil volume, sparge into multiple containers and slowly add the extra back into your kettle as you boil, keeping it at your preboil volume. Once you get all the wort in your kettle, start your boil time. You'll get some lovely caramelized flavors and a higher gravity.
Cheers!