Yes, it’s normal. A Christmas Cactus’ blooms will last anywhere from a week to two weeks. You can pick them off when they start to fade, as soon as they’ve lost their perkiness. A wilted flower will only drain resources from the plant, so picking off the faded blooms will keep the plant happy.
Not very long and that is one of the reasons I don’t spend much time with them.
yes, its normal, pick off the dead flowers. Also next year to get it to bloom put it in a dark closet for a couple days then take it out and it will bloom!!!
It would last for a week or two according to the temperature you maintain