I've tested the run that Anprman has posted and it took me 2 hours and I made just over 2.5m. However, I didn't have the requirements for all of the available shops so it will take longer and you will earn some more money if you can access them. Here's a breakdown of what I made (this is pure profit):
Vials of water - 233,376
Plant pot - 403,480
Vis wax - 530,460
Feathers - 329,000
Bagged plant 1 - 512,072
Yak Hide - 358,848
Magic Runes - 143,300
Harpoons - 543,907
IMO some of the things didn't feel worth it. The harpoons were the worst as there was no bank in Port Sarim and I had to run back and forth so many times at Catherby. This was closely followed by 'Bagged Plant 1' for the same reason as the harpoons at Catherby. However, as you can see, these things reaped the most profit. So it's really up to the individual whether you want to spend that time on dailies. I think this is something I will do either if I'm really short of cash or just a couple of times a week. Thank you Anprman for sharing