Builds while grinding Chronomancer?
If you are trying to grind out the Chrono general PVE does not require anything specific and you can choose what you enjoy for the most part, whatever that weapon set may be and what build you think you may enjoy. For other parts of GW2 depends on whether you are using a power, hybrid or condi build.
You might want to look at this reddit post about how to efficiently unlock the hero points.
all you need is swiftness and jump on the EOTM train.