I've seen MapConfig creation requests take 10 minutes before responding.
And these 10 minutes being all spent waiting for an answer from the SQL-API
in the findLastUpdated or affectedTables queries.
A timeout needs to be set, doesn't make sense for those queries to go on for more than a fraction of a second.
Don't know if the timeout should be configurable.
JIRA REF: https://cartodb.atlassian.net/browse/CDB-1874