Was the Pearl Harbour attack originally intended to be a single killing blow or multiple assaults?

I've written a few older answers about the attacks that may be useful to you:

But that said, I'm not completely sure what you're asking. There were two waves of Japanese attack aircraft that struck Pearl Harbor and other installations on the island, but the two waves represented one sortie for each aircrew -- that is, all the aircraft available to the Japanese fleet that day were used in the strike waves or for CAP. There was some controversy following the war over the question of whether a "third strike" was discussed or planned (it seems not to have been) but the Japanese fleet departed the area immediately after recovering the second wave. So there were two distinct assaults that day on multiple targets, but the fleet was not intended to stand off and strike the island multiple times (among other things, the land-based aircraft in Hawaii alone outnumbered the Japanese air arm, and the Japanese also knew they didn't know where the American aircraft carriers were.)