Returning to Chengdu straight from where the battle occurred took quite a bit of time even with him driving at top speed. Along the way, he encountered many different things.
First, a pack of beasts. Wolves with red fur tried to ambush him. But they were easy to deal with. Jessica cut them to pieces and grilled their meat. As an NPC from a post-apocalyptic game, she had more or less mastered her skill, cooking included.
Secondly, the uneven road made them waste much more time than expected. It took them roughly twenty hours to travel back. During which they had to stop three times to rest before resuming their trip again.
Due to the drugs they administered, fake Tang Yao and Tang Soso stayed unconscious until they reached their home base. Leo stuffed them into two barrels before he entered Chengdu to avoid suspicion. He also returned his bike into a capsule form.