It is currently not possible to configure the maven connection and read timeouts in Fabric.
If a repository is unresponsive we may potentially wait for a long time before getting an exception in the form of

2016-09-19 11:46:28,891 | INFO  | dataResolver-5-0 | RetryExec  | 125 - io.fabric8.fabric-maven - 1.2.0.redhat-621159 | I/O exception (java.net.SocketException) caught when processing request to {s}->https://repo.fusesource.com:443 : Connection timed out

Also, its not clear what the effective timeout values are.