Hey, lets put aside the measuring stick !   The right height (IMHO) is what FEELS right to you. Not too much rattle on the frets but not too many blisters on the finger ends. Only trial and error will establish this, but adjust at the bridge primarily.

To ease yourself back into it gently, may I also suggest you try to get some TAPE-WOUND strings for it - a good music store or on line should be able to locate them, personally I use them all the time, mine made by Rotosound on Gibson EB2 (1957) not only easier on the finger ends, but give a deeper / softer tone too.   And when you slide - wow