Set OperationTimeout when creating MessagingFactory from Connection String

There seems to be two ways to create a new MessagingFactory - Create() and CreateFromConnectionString().  I have been using the later, but now I need to adjust the OperationTimeout which you can only seem to do using Create() - and that requires a TokenProvider. 

So, how can I set the OperationTimeout using CreateFromConnectionString(), or conversely, how can I use Create() if I have a connection string?

Thanks for any help,

Bob