I suppose it costs one Casio F91W, but I get what you mean. Good-quality incense burns pretty consistently -- when I sit, I sit the time it takes one stick to

I suppose it costs one Casio F91W, but I get what you mean. Good-quality incense burns pretty consistently -- when I sit, I sit the time it takes one stick to burn down. There's even incense-burners that will ring a little bell when the stick burns down, but I just stay aware of it.