Am new to the whole Exploration side of ED gameplay. How long does a round trip like this take to complete? Thanks.
Single trip to Jaques - will depend on your ship's jump range and your stamina.
Distance is about 22,000 ly, so anywhere between (roughly) 500 and 2000 jumps, so 8 to 35 hours of jonk time.
The current CCC is scheduled for one month, which should make it one hour/day for a fully loaded slow carrier (or escort). If you want to tag along, read
this thread, then apply for Fleetcomm membership and hurry up. The fleet's meet-up point for the rest of today is at Hillary Depot.
But: the highway to Jaques is really well travelled by now (and the 400+ CMDRs of the CCC won't make this better), so if you take the direct route between the depots (and/or other waypoints, or along one of the neutron highways), you're not very likely to find many unexplored systems. On the other hand, if you're within the CCC, you'll have armed escorts and unarmed stratotankers eager to help you with any problems you might encounter on the way.
And if you decide to come along, don't forget to take along some
Galactic Travel Guides.
Errrmmmm....

... what was this thread about again?
Oh yes, cargo racks. Nope, put me in the 'no' group. Well, _if_ you have spare compartments, then maybe, for the jump range adjustment thingy. But honestly, none of the ships I had so far were so big that I had the luxury of spare compartments. But carrying cargo (any kind) when returning to the bubble after a long expedition trip is like playing russian roulette with an automatic pistol.
There is one good reason for cargo racks, though: to take along some sacrifice to the great mother of all, the ultimate fate of all in this galaxy, the great Black Hole in the center of everything. Hutton Mugs or occupied escape pods are usually deemed adequate.