Odd way of counting indeed but he can manage just fine. To be honest, it wasn't something that mattered all too much to him. The visions Maul had received were vague and he could only imagine that Luke was young at the time of that fateful eve. What mattered the most was that this man standing before him would bring about the end of the Empire yet what he saw was not what he would hope for.

"Three days," Maul repeated, "did the old man get lazy?" There was simply no way Kenobi would give up. Something had to have happened and he was going to be awfully mad if it was the something that his mind jumped to.

That said, "Ah, you met the padawan." Was it as strange for you as it was for him? "I cannot change anything, young Master. I am dead." If you wanted to speak bluntly then you're in good company, Luke. "It is you, to my understanding, who is the one to change things."