I have 2 ginger bulbs planted and while the plants grow fast (it has grown from zero to this in about a month), they are getting very high. Right now nearing a meter. The plant is mostly on a windowsill that gets afternoon light. I took the picture elsewhere just to get a better image.
Could the windowsill be too intense with light? Although, I have to say, it almost never gets direct sun.
You haven't said which ginger this is - assuming its the type of ginger where the root is used for cooking, that plant does not like direct sunlight, though it appreciates dappled sun. Your plant looks a bit etiolated, so it's not been receiving sufficient bright daylight - the stems look a little weak, but lack of air movement could be contributing to that.
If you can increase its daylight levels without exposing it to hot sunlight between 11 and 3 in the afternoon, then stand it there, preferably near an open window to allow air movement. Otherwise, it may do better out of doors if your conditions are appropriate, but it will need hardening off first.
You appear to have a very healthy plant and no cause for concern. They will eventually reach a height of 2 feet or more in a container, and may reach a height of 2-3 feet in the garden. It has probably reached its height limit now so if I were you I would return it to where it used to be and keep up the same good work.
