1000 merits? Easy. That's one load (64 tons) of Kamitra Cigars (one of the few rares that spawn reliably in a largen amount) shipped across ~200 ly, i.e. one tank of fuel/5...6 jumps in my Cobra Mk.V. So if you hurry, maybe 20 minutes for 1562 merits (and 1.17 MCr. profit). If the system you want to sell in actually lets you trade thoseEven if you earned 1,000 an hour
Undocked at Wakawal for the first trip yesterday at 19:33:46
Docked at Fisher's Rest in Aldebaran at 20:00:07 (+1562 merits)
Undocked at 20:06 (after checking out the bar and the local gun store)
Back in Wakawal at 20:23:35, 782 merits for the rares and 2000 merits for the weekly chore (sell 10 rares at Wakawal)
That's a total of 4344 merits in 50 minutes. Yes, the amount of weekly chores is limited. And yes, you still need some time - but not quite as bad as your estimate. In total, yesterday I started at rank 28 and finished at rank 30. 4 more ranks to go to unlock the packhounds. Ok, completing two of the five weeklies yesterday probably helped - but in this week's list, there are only three I'll lilkely tackle. I won't do the "be a criminal" or the "collect data from surface installations" tasks.
Oh, and going back to those 1000 merits - another way would be to scan 2 megaship data uplinks. Those give 500...750 merits each, and there are a few ships with two uplinks. Downside is that that is (as a targeted activity) rarely faster than hauling in rares, upside it's more variation. If you get that as a weekly, completing this task alone will advance you one rank.