How many hours does it take to drive from Vienna International Airport to Hallstatt by car? How is the road condition at night ?

4 hours or more, not recommended to go at night, Austrian highways are relatively narrow and the locals drive relatively fast. It's better to go during the day, easier to adapt.

Be careful not to drive at night when you are unfamiliar with the place.

It's not recommended that you go to Hallstatt directly on the same day, as you will arrive there at noon if you start from Vienna in the morning and there will be no parking space. It's suggested that you stay one night near Hallstatt and go there early the next morning, so that you can find a parking space. After you get there, you can visit the salt mine first and then stroll around the town.

I think it's great to drive for 4 hours. It's thrilling to drive at 140 miles per hour on the highway.

Basic 4-5h, and the lake area is mountainous, there may be wildlife. I suggest you go during the day. The night view is also good.