Bought myself a bunch of materials for about 3.5m. I should make about 1.6m back from the essence once I craft it into Earth Runes, if not a little more. Obviously the Maple Logs won't make me any money, but the Salmon should get me back about 930k. So, for a loss of about 1.2m (will still have over 10m in the end <3), I will get 55-60 Runecrafting, 80-90 Firemaking, and 70-80 Cooking.
The essence makes up for 553 round-trips to the altar, which take about one and a half minutes each (almost 14 hours). The logs will take me 914 inventories to burn them all, and those take me just over a minute, I think (19-20 hours). As for the fish, they take me 534 inventories since I'll be making fires myself and cooking on them (quicker + helps with firemaking xp, even if just a little). I think those take me about the same amount of time as the log inventories, so just over a minute for each as well (11-12 hours).
Don't forget Crafting! I'm not buying the materials for that ahead of time because I would need like 21m. However, I can resell the finished products for about the same price I bought the materials for, so it'll work out in the end. But basically I'll be buying cut Emeralds, Gold Bars, and smithing them into Emerald Rings. I know Emerald Rings will sell well because they can be enchanted into Rings of Dueling which are used for so many skills (easy banking). I'll need to make 8430 rings, which is 649 inventories (13 per), and if each take me a minute and a half it's just over 16 hours.
tl;dr: I'll try to play for a total of 62 hours between today and the end of next week so that I can reach 600+ (607) total level and only lose 1.2m.
Poll