At the other end, without pulling the tubes out too far and compromising strength / stability, I reckon you could extend to around 94cm. It is fine if you're sitting, and obviously it depends how "thick" you're keyboard is, too.
Rockjam RJZZ363 Z-Frame Keyboard Stand, Heavy Duty Adjustable Digital Piano Z St
Z Frame Electronic Keyboard Stand Braced Height Adjustable for Keyboards & Piano
Z-Frame Keyboard Stand Adjustable Keyboard Piano Riser Rack With Lockable Wheels
