Gisher |
The duration works like any other performance; you spend one round of performance for each round that you use it.
If your level is 6th, 7th, or 8th then you only have +1 to spend so you could either add Ghost Touch or Keen to an enchanted weapon but not both. At higher levels you will be able to add +2 or more so you could add both. You never spend more than one round of performance per round.
It works fine with Lingering Performance.