If you have enough hieroglyphics you can craft two amulets at once for day 9 (since I still have to finish that too) and your desert tomb will recharge during that 4 hours. You may need to still collect again before you can craft the amulet. It?s going to be tight. Someone suggested it might be better to gem purchase the amulet. As noted above, if you have the supplies, you Should be able to craft the last amulet and the translations of the tomb at the same time.