half day tour

We would be taking the half day tour only to the terracotta museum on Jan 15, 2016 Friday. Couple questions:

1. How early does the museum open?
2. How long does it take to drive from Hilton Xian to the museum?

We have plans in the afternoon, and?will try to take the tour early in the morning, one museum entry only for each of us, and then will probably return to the hotel for lunch.

Thanks,
Ajit