Do you need 2 instances of Azure websites for SLA like Web Roles?

Question

On cloud services web roles you must create at least 2 instances to get Azure\'s 99.95% SLA because when they do updates to the servers\' OS etc, Azure will need to restart

Answer 1

We guarantee that Web Apps, Mobile Apps, Logic Apps, and API Apps running in a customer subscription will be available 99.9% of the time, with a 99.95% SLA provided when multiple instances and traffic manager are used. No SLA is provided for Apps or sites under either the Free or Shared tiers.