It's difficult to know, unless there are reports of a given hybrid doing it regularly for someone.
I have a NoID which holds the same flowers for 6 months rather than the usual 2-3 months. Others will keep putting out new flowers before dropping then. The plant needs to be healthy to do that, but it also needs to have the genetic disposition to... and it's hard to know which might have that without just watching out for people talking about one doing it on threads like this.
Some are 'sequential' which means the spike keeps growing putting out new flowers. However the species that do this tend to only have one or two flowers on a spike at once. I have one, bellina, which currently has two good flowers an old flower fading and a new bud forming.
Non-sequential ones tend to grow all the buds at once, then when the first flower opens stop growing buds, so the spike has lots of flowers at once but doesn't keep adding to the spike.
With hybrids you can have a mixture of parentage, so you do sometimes get once that will put out a flush of flowers like a non-sequential, then decide to extend the stems further. But mine that did that once, only did it the once.
Another thing to note. The ones that generally flower once a year, will often miss a year after you buy them. This is because they are brought to bloom at artificial times for the mass market and it takes them a while to settle back into the seasonal cycle.
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