Amazon's Virtual Call Center is open from 3Am-Midnight (Pacific Time); and there are several shifts available including days, afternoons, evenings, and weekends. This is a Seasonal opportunity with Amazon, and it is expected to last up to 6 months. However, there may be opportunities for regular long term employment after the seasonal job ends.
The following information is quoted directly from the original job posting on Amazon's official website:
Seasonal Customer Service Associate, Amazon