Proper watering rules for a large potted madagascar palm.
Certified GKH Gardening Expert
You will only want to water when the top of the soil is almost completely dry. They are slightly drought tolerant but will not tolerate wet feet. Less is better in this case.
Here is an article that will help: https://www.gardeningknowhow.com/houseplants/madagascar-palm/madagascar-palm-care.htm