Fill the basket with unlit charcoal leaving room for about 10-15 lit briquettes on top. It will burn down slowly like a pipe. Distribute a few chunks of smoking wood throughout the basket so one chunk will be engaged in the fire as it burns down to the bottom. You should drastically improve your burn time this way.
This is called the Minion method named for Jim Minion who came up with it.
Jim - Another transplanted Texan
Former KCBS CBJ
Large and Medium Big Green Eggs , Black 18.5" WSM, Blue Weber Performer - Stainless, Green Weber OTG Kettle , Brinkmann SnP Pro, and a Stainless UDS. One retired Portable Kitchen grill.
Red Thermapen, Maverick ET-732, EdgePro Apex Sharpener.
Avatar is the original 1951 Weber Kettle