I haven't used a charcoal basket at all in my mini. I just load up the charcoal grate to the rim where the bowl sits w/ lump and wood chucks and leave a small hole in the middle. Then put about 1/4 of a chimney of lit coals into the middle and place the pot onto the bowl.
With Royal Oak I can get about 6-8hrs of cook time with a full load. 6 hours during the colder months of winter and 8ish hours when i was smoking stuff during the summer.
*Weber Mini WSM* *Weber Touch and Go Performer X3* *Sublime Smoke UDS* *Maverick ET-732 * World's Fastest Blue Thermapen **Pitmaster IQ110*