That is the unanswerable question. Wax melts aren't like candles where you can measure how long a candle burns (and even that varies in different scenarios). There are so many variables that affect the strength and length of burn with our wax melts. Two of the biggest variables are the scent itself (some are just stronger and last longer than others) and the type of the warmer affects the length of throw time (tea light, hot plate, bulb - and all the different wattages for the last two types). Melting different scents in adjacent rooms can also affect scent strength and time as some scents naturally mask or overpower other scents and may make it seem as though one scent doesn't smell very strong or very long. So this is the one question I simply cannot answer for you.