Edited by RED
In the end, Zhang Che didn't dare let the Purple Jade Condor fly its fastest. Otherwise, there was a chance of him slipping and falling no matter how hard he was holding onto it.
Moreover, there was no shield on this biological airplane. Once the speed reached a certain limit, the strong wind wasn't something Zhang Che could endure. Even breathing would become a problem.
After experimenting for a bit, Zhang Che discovered that he could barely take it if the Purple Jade Condor was flying at about five hundred kilometers per hour. If it went a little faster, the wind would become too strong for him to breathe properly.
{Editor's Note: FYI, a normal human finds it very hard to breathe at 120 mph, and he's going about 300 mph…}
Of course, this number wasn't very accurate; Zhang Che had no way to calculate this on his own. His personal terminal had such a function, but it was unusable in the beast world.