Burn times vary by fuel type and canister size. Most chafing fuel canisters are available in 2, 4, and 6 hour options. For shorter events like a dinner party, a 2 hour canister is typically sufficient. For longer gatherings or buffet-style service, choose a 4 or 6 hour option. Many canisters have twist or snuff caps, so you can put the flame out and save the rest for the next event.