Hello Veritas00000! I can help you answering most of the question you may have about Morning Glories (Ipomoea) since I cultivate them year-round for sale.
Morning Glories can be cultivated indoors, but most of them will need a high light source, in order to produce flowers. If they do not have this high light source they will produce very few flowersand the leaves will grow bigger than normal. But there is a variety, that is called Ipomoea "Cameo Elegance" that do not need that much light and is more suitable to be indoors, even more, this variety is killed when is placed in a full sun or under a very high light. And a very beautiful characteristic of this plant is that its leaves are variegated (green and white). But always remember that they all will need a netting or a stand to climb.
About their aroma... most of them do not produce aroma, but there are some that do. There is a variety of Ipomoea batatas (sweet potato) that have a very light aroma. But if you are looking for a very, veru fragrant one, you must go ith Ipomoea alba (Moon Flower) This plant is part of the Morning Glories, but it flowers open at mid evening, 3 to 4 pm and will last the rest of the evening and the night. BY the next morning it will close. But each flower produce a very intense aroma, and since thisplant is very prolific, each plant will porduce at least 3 flowers per day, and with 3 flowers you can be sure the smell will cover much or less a squeare mile.
About how aften do the produce flowers. From spring to lte autumn, they can produce flowers daily, if they have the right light and temperature. This contitions will determinate the amount of flowers and the time that each flower will last. Most Morning Glories porduce flowers as the name sais, in the morning. From dawn, untill noon, as soon as temperature rices the flower will close. Though the violet-colored flowers can last for the whole day (Ipomoea indica)
Morning Gories (Ipomoea) is a very diverse and widespread genus, there are plants suitable for most of the conditions and enviroment, there are even Beach Morning Glory (Ipomoea pes-caprae) which are found covering large extention of caribbean beaches. So you can find somes that can fill your needs.
I hope this has helped you, if you have other questions, just ask