I could tell you, my ex yan yan also do the praying 5 times a day, although the progress will not longer than 5 mins, but she has to wash her leg, put on the pray uniform (white from head to dress), and make the floor mattress, therefore, @ time will take 10 mins at least.
If she follow the praying requirement, she also has to stop eat/drink from dusk till dawn for a month before Indonesia New Year.
During the praying progress, no matter how urgent or on fire or you talk to her, she will keep quite and continue praying, I am not sure she could keep the kids in room.
If your have elderly at home, I will consider to renew her contract if she only have such request. Otherwise, you should better find another maid.