How long of a process it is to have someone removed as executor of a Will?

Question Details: My dad is a sibling of 5 children. My grandmother just passed away a couple of weeks ago and she had an original Will that put the eldest as executor. She had changed some things up including executor and had made a detail list of some items in her home as to who would get them but had never filed it to make the changes official. The current executor has tried to remove some things from the property without the other siblings knowing and placing some of the "unofficial" items in the estate sale that was suppose to go to great grandchildren. How long and how hard would it be to remove her as executor to allow things to be divided accordingly? Side note, this is not the first time hat this sibling has tried to get things for herself.

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