I tried to search through the net, to know how long will the stem generate a branch. Some articles say about 2 to 3 months. But I was fortunate to find out that the upper parts with the leaves that we transferred have grown new roots in less than a month.
I was more amazed when a saw new leaves emerging from the stems in just about a month. What amazed me is that I just left the stems without caring for them. I never fertilized them. The month of January though has rainy days mostly so it is nature that cared for the orchids.
Soon this plants will be growing a brand new vanda that will soon give second set of flowers.
I won't guarantee the same result if you do what I did but just in case you want to do some experiment this experience of mine might give you an idea.
Happy planting everyone.