I've used several, but I primarily use the candle method--with Jim In Idaho's counting suggestion. Prevents burned fingertips.
For large amounts of brass I have an Anneal-Rite machine,
https://www.cartridgeanneal.com/Probably the most precise method (and somewhat quicker than the candle method) is an Annealing Made Perfect machine, but they cost around $1000,
https://www.ampannealing.com/ Have tested one thoroughly but haven't purchased one--yet.
