I have a peace lily that was doing wonderful for 2 months. It is in a well lit, but indirect lighted area. I watered only with mild drooping. I repotted in a slightly larger stone pot w/fresh soil 1 week ago. This pot had a large drainage hole at bottom.I watered it at that time, it drained a lot of water or into saucer. I emptied it the next day. But it hasn't perked back up and leaves are yellowing from overwatering I'm assuming. Will it come back, if so how long will it take?
Peace Lily do like to be a bit root bound, though if the roots have taken up all the soil the plant can have trouble taking up water and nutrients.
Make sure you used a new pot size that was 1 size larger then the existing pot.
The soil should be a good quality potting mix and make sure the excess water is draining from the container.
To large of a container can lead to overwatering and root rot. The yellowing leaves generally are indicating a watering issue; too much or too little.
Check the soil, instead of watering on a schedule. Water only when the soil is dry.
You may want to lift the plant and allow the soil to dry. Then it would be good time to determine if the pot is the correct size.