I also don't want to sound harsh. But if you have to take them every 30 minutes you are not training them at all. You are only training yourself to remember to take him on the chance that he goes. When the provider is caring for multiple children, answering the phone, preparing meals, providing preschool training, taking children outside to play, sweeping the floors, changing the babies, helping the children to pick up their toys, directing free play, being a referee, and attending to anything that comes up at any time, you don't have time to play the game of hit and miss.
It is the parents job to work with them on the nights and weekends when they are the parents only priority. When the child is able to go every single time, but still will not telling the provider, you are closer. But you are still a long ways from being done. It is at that time that you make sure the provider has pull-ups and only loose fitting stretchy pants. Absolutely no suspenders, overalls, pants with zippers or snaps should be sent during training. Also, the child should be able and willing to pull down the pants, step up onto a step stool or stand on one, go either sitting on a seat or standing depending on moms preference, get the toilet paper, use the toilet paper, climb down, pull up the pants, step up on the stool, turn on hot and cold, lather up and rinse, shut off both hot and cold, pull off some paper towels from a rack that I hope is in a busy bathroom like that, and put the used paper towels in the trash. These are the steps it takes to potty and while we take them for granted, they are tough for kids at first and some don't even want to do it.
I am going to tell you the God's honest truth. If any parent EVER sat down on a sofa during an interview and it smelled like pee, they would run for the hills and probably turn the provider in to the health department. An untrained child should NEVER arrive at anyone's daycare in big boy underwear. That's why pull-ups were created. Urine and feces is dirty and unhealthy and no child should be subjected to such unsanitary conditions. We don't live in the dark ages anymore. We live in the new Millennium and thank God we do!
Potty training will take exactly how long it is intended to take. If you start before they understand, before they are ready and if your motivation is to save money on diapers, then it's going to take 6 months. If you wait until the child does understand and is able to hold it at least 1-2 hours at a time, it can take as little as one weekend. Some children don't want to train. Motivation is not something you can just buy in a bottle.
I am sure that your provider is willing to do all that she can do. If she doesn't care about soiled furniture and floors then so be it. I wouldn't use a provider that is so careless about bodily fluids. But that's the moms choice. It might go faster if the child hates the feeling of wet clothes. But I've been at this over 20 years. Most boys could care less if they are soiling themselves or the furniture.
Suzi