I would say 3-4 hours, depends on how fast you are. Go to Cummins and ask for Part# 3958017 it is the tab to hold in the kdp, costs a couple bucks. This is a good thread on the issue.
https://www.turbodieselregister.com...07-how-many-have-seen-kdp-24-valve-truck.html
My 98. 5 was hanging out 3/8 of an inch, i punched it back in, and used the tab.
Dirk
post #33 from above should answer most questions as to who/when to be concerned about a KDP.

PS- ALL 5. 9s are susceptible to the case bolts falling out, so remove them one at a time clean, locktite red, re-install, re-torque. Done.

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