Yes. It takes a few days.
Yes it does require background check. They complete background checks on your education information and qualifications history to confirm whether everything on your CV checks out and this process takes less than 5 days.
Yes they require criminal record checks and also they request your matric certificate (high school qualification)
Yes Amazon.com does require a backround check. They scan your fingerprints and check for any criminal records. It takes about 5 minutes.