Wow
This is Kawaguchi Hidetoshi. This is a humble answer to the question.
http://ja.wikipedia.org/wiki/供養
A memorial service is “sincerely offering offerings such as incense, flowers, lights, food and drink, etc. to Buddha, Bodhisattva, etc.,” and offering a memorial service with a good scent is one of them. The good scent of incense and incense sticks will satisfy your sense of smell within your five senses, and you will be able to spend your time comfortably. I hope you can think of it as a reason for incense burning and incense sticks for your ancestors. If you think about having a comfortable time, I think it can be said that it is similar to the effects of aromatherapy for us.
Regarding the number of times incense is burned, I think the content on the following site will be helpful.
Information site useful for funeral etiquette and funeral preparations
Basic knowledge about funerals and funerals home>How many times do you burn incense?
http://manner.sougi-support.net/incense.html
Tendai Sect 1 or 3 times (not particularly particular)
Shingon Buddhism 3 times
Rinzai sect 1 times
Soto sect twice (the first time you put it on your forehead, the second time you burn incense without receiving it)
The Jodo sect is not particularly particular
Jodo Shinshu Honganji school 1 time (without putting it on your forehead)
Shinshu Otani school 2 times (without putting it on your forehead)
Nichiren sect once or three times
Nichiren Masamune 3 times
※ Please think of it as “bringing it close to your face”... and “putting it on your forehead.”
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From the original purpose of “sincerely offering offerings such as incense, flowers, lights, food and drink, etc. to Buddha, Bodhisattva, etc.,” I think it would be enough to guide sentient beings, just once to the dignity of Buddha, Bodhisattva, and various heavens, etc., but I think it is important to make voluntary offerings thereafter.
I am trying to do a total of three times: once to the dignity of Buddha, Bodhisattva, and the gods, etc., once to the priests, groups of monks, and the sanga that protect Buddhism, and once to all sentient beings to exert Buddhism. Three incense sticks are often offered in this way.
Nonetheless, I think the most important thing is to “sincerely offer offerings” to the target of the memorial service regardless of the number or number of times.
Kawaguchi Hidetoshi Gassho