An ergonomics study at Cornell reveals that while sitting remains unhealthy, so do prolonged periods of standing. Their bottom line:
Sit to do computer work. Sit using a height-adjustable, downward titling keyboard tray for the best work posture, then every 20 minutes stand for 2 minutes AND MOVE. The absolute time isn’t critical but about every 20-30 minutes take a posture break and move for a couple of minutes. Simply standing is insufficient.
Good to hear, since most standing desks I’ve come across are quite expensive.