What are the page yields for standard and high-yield toner cartridges in the Brother MFC-L3720CDW?

The MFC-L3720CDW uses TN229 cartridges: standard black yields 1,500 pages and colors 1,200 each, while high-yield TN229XL black jumps to 3,000 pages and colors to 2,300 each, effectively doubling runtime. The separate DR239CL drum lasts 30,000 pages, outliving several toner replacements.