Ex would like 11/12 daughter to stay at home alone

So my daughter who is 11 and will turn 12 at the start of summer may have to be alone during one day of the workweek during her summer visitation with mom, It looks like 2, possibly 1 day a week that my current 11 year old daughter might stay at home alone. Her mom will come home for lunch. Otherwise, my daughter will have to stay in and follow standard protocol, procedures and what to do in an emergency while mom is at work. The other days she will be going to a day care/camp. But my ex is struggling with affording the full cost. I am concerned though. I've left her alone sometimes but no more than 20-30 minutes. My daughter is looking ay 8 hrs with a lunch visit in the middle. My daughter is mature and very responsible. she's also very innocent and naive. I know she wouldn't answer the door if someone knocked, but if she panics I'm concerned she may make a mistake or worse. I'm also concerned with boredom and especially loneliness. What do you guys think?

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