Rackspace to RDS using DMS (Postgres 9.2)

Hi guys, I posted this question on the ADMIN list but will post here as
well so more people can comment...
https://www.postgresql.org/message-id/CAJNY3it_AfxJhmwMHtpiAbHG47GS5rJOAUgfHw%2BGm5OXCbUm7w%40mail.gmail.com

I've got a 2.3TB Database running at Rackspace... We'll be migrating it to
RDS PostgreSQL 9.5 very soon...

We already have an EC2 Instance at Amazon running PostgreSQL 9.2 as
streaming replication from Rackspace.

I'll have to upgrade the version of Postgres on that instance before start
using DMS service.

*Question:*
Has anybody ever used that service? I'm just trying to find out how much
time it will take to perform the migration...

Thanks!
Patrick