Waiting in a dock and picking up the stock regeneration every ten minutes is the wrong way to go about it. It'll probably
work - there is basically enough regeneration over the next six days to finish the CG - but it's obviously not very interesting.
When initial stockpiles ran out last time round - which took a bit longer - I was generally able to pick up 200-400t per run still, by thinking about where supplies might have regenerated more than that. I don't think I'll be able to do that well again this time - more participants draining the markets faster - but I'll still do better than "sit in dock and wait" [1]. The logistics report at
https://cdb.sotl.org.uk/logistics/WzEsNjAwMDAwLDYsWzIxLDY4LDM5LDAsMF1d has all the information you need to be smarter about it.
You can also work to boost the regeneration - the Civil Liberty state will almost double the regeneration rate, and most of the supply systems don't have it. So a bit of heavy bounty hunting in one of them today might make hauling easier tomorrow. (Well, the day after tomorrow, 1 day pending)
This is one of the few cases where the Elite Dangerous economy actually does something interesting at a macro level - supplies running out is basically never a possibility in the bubble except in the very immediate systems around a trade CG (and so you have to make an extra jump per round trip, big deal) - but I'll certainly agree that it's only interesting if you actually understand the logistics problem it's setting out, and there's not enough in-game information to really do that. One of the reasons why I tend to argue against "player-driven economy" or "add actual supply-demand production chains" when that gets suggested: it's cool that it can happen occasionally in special circumstances, but imagine this sort of thing happening all the time in the main bubble.
[1] If you
are going for the "sit in dock and wait" strategy, do it at Rock in Chrysus - that's got the fastest ten-minute regeneration by a significant margin, and there are big advantages to everyone using the same dock for it because of how the game handles stations at zero supply.