Burning 2 candles at once

Ik for a fact u can use ur conjured Candles this way by snuffing but spelled i think your supposed to burn til it goes out, unless u leave the house.

The booklet says spelled candles should burn for at least 6 hours but can be snuffed out and started again

Most spelled candles not all are also reusable. Meaning they can be used for a new spell or person. They do not all have to be burned until it goes out. It will state reusable in the description. However, I would still wait at least 3 days between candles