At average speed, one can do about 60 trips to the fire altar via the Abyss per hour, using the amulet of glory to teleport back to Edgeville, and using the tool belt items to mine through the rocks in the abyss. You need to recharge your pouches every 7 to 9 trips, to prevent the giant pouch from degrading. Using the small through giant Runecrafting pouches, and an Abyssal titan, you can hold up to 74 essence per trip, resulting in a profit of coins per trip.