To properly value your case, you will have to wait until you have reached “maximum medical improvement.” In other words, you have to recover as fully as you are likely to. This is because the best way to assign an accurate value to your case is to show the costs of your treatment, both past and possibly future. How long a bedsore takes to heal depends on the seriousness of the sore. For example, minor bed sores can take several days to heal, while others may take weeks, months, even years in more extreme cases.