It had been a day (RT) since Sato was stuck in this world which meant that he had been in the game for two days (IGT). An average human would have already begun to feel anxious and distraught over the fact that they had experienced what felt like two days in a virtual world without a sign that there was an exit.
However, Sato was a former pro gamer and had worked in a large guild where he had grinded for days and raided dungeons in battles that took more than forty-eight hours in real-time. So, a mere twenty four hours were nothing more than a breather for him.
Nonetheless, the fact that Sato could last long didn't mean that he planned on doing so here.