Candles offer a nice, warm homey atmosphere to a dining table, or living room, etc
A simple way to make them burn longer is to freeze them before use.
A friend of our family ran a catering business that specialized in things like banquets (you know - rubber chicken events).
They would buy 'timed' candles (2, 3, 4 hour, etc) based on how long the event was scheduled to last.
Obviously, 2 hour candles were cheapest, and the price went up, depending on longevity.
Why buy $2 candles if $1 candles would do the job?
He would store them in the freezer prior to use. Claimed he could get an extra hour or 2 out of each one.