Hi Ttirub
Reading threads on other sites that are solely about court orders I think that these arrangements last until the child is 16. There is an option to ask for a variation to the existing order via court where you request for amendments to be made in the interests of the children’s wishes. C0hildren over the age of 11/12 generally get their feelings noted
My understanding is that as long as what is presented is purely in the children’s interests and not about restricting access to the other parent then there generally isn’t a problem