I think we should truncate travel a little bit and simplify.
-Greens are Interstate Freeways. You can travel from one end of galaxy to other on a green fairly quickly, time starts adding up once you get to yellows. Traveling from ANY Green located planet to another is only 48hrs. UNLESS youre traveling to an adjacent world from Green to Green, in which case it is only 24hrs. So you could move from Bonadan to Eriadu in 48hrs if you want because you'd never have to get off the Freeway so to speak. Roche to Coruscant, 48hrs. Brentaal to Sluis Van 48hrs. Possessing worlds on major Green Routes then becomes very strategically important to logistics. Sluis to Eriadu 24hrs. Corulag to Chandrila 24hrs.
-No added time for crossing Rim borders
-Each segment of Yellow stretch adds 24hrs itself. These are rural one lane highways. If you're only going from one town to the next over its pretty quick, but really adds up when you start getting deep.
Along this system then..
Bastion to Coruscant, 5 days via shortest route (Bastion to Dantooine yellow 24, Dan to Dathomir yellow 24, Dath to Bandomeer yellow 24, Bando to Coruscant Green 48)
So by this system calculating Bonadan to Tynna.. it is 3 days. 48hrs for starting at Bonadan on Green and moving along green whole way until you get to that yellow line splitting off to Tynna, which adds 24hrs itself.
I think this works decent but just my suggest to curb travel times a little and help everyone out some.