Based on the existing answer, it is possible that a vault may not have harvested since 20 hours ago. This could be due to a variety of factors, such as the amount of deposits made, the size of the vault, or the amount of time since the last harvest. It is important to note that vaults generally harvest at least once every 24 hours, but may also harvest more frequently depending on the amount of deposits made. Additionally, if the amount of deposits made is particularly large, the vault may take longer than 24 hours to harvest.