Dominating the World by Stopping Time

Lu Xi transmigrates to a novel, there he finds out that the world is trying to destroy him [Obliteration Countdown: 2 hours, 57 minutes, 0 seconds. 】
His ability is so powerful the world wants him gone. Luckily he finds his ability, sadly no teleportation, but for others, it still feels like lightning speed.
Later on, legends say “Lu Xi has faced a hundred thousand enemy troops alone, and in the next second everyone was lying on the ground as if they had been hit hard!”
How strong can he get before his time runs out?