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

You can download the Azure Web Sites SLA document here: http://azure.microsoft.com/en-us/support/legal/sla/

It does not state that you need 2 instances to get the 99.9% SLA but clearly state that the Free and Shared Web Site Tiers are not covered by this SLA.

Answer 2

A developer on the Azure Websites team has replied here that

the SLA for any Azure Website on the Basic or Standard tier is 99.95%

Just having one instance of the site is enough

Answer 3

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.