UPDATE:
Five days after question was asked, I partially took my own advice. Sold 12 403 units of ice, bought @ 238 000 each + 2.5% broker’s fee. After free compression and self-haul, the sale price achieved was 309 288 each. Or 27% profit.
However, if OP had done that daily, as advised:
Day 1. 60 mil isk. Buy 245 units, bought @ 243 950 each (including brokers fee). Sell for total 75.765 mil.
Day 2. 75.75 mil isk (after 10 k contract fees). Buy 310 units.
Day 3. 393 units.
Day 4. 498 units.
Day 5. 631 units. Sell, for total 195 mil isk.
So, 60 mil increased to 195 mil in five days. Just curious - what have you decided to do with your 60 mil ?