How many days will it take for an ruptured eardrum due to a middle ear infection to form back and what are the advice for perforated eardrum?

Weeks: This typically can take weeks. This should be monitored by a primary care physician or ENT to ensure the rupture heals. No submersion of the ear under any type of water until it is healed.

Very fast: Almost all ear drum perforations heal within a few hours to days. Very very few leave a permanent hole. It should be treated with antibiotics.