That sounds like a great idea.

Every Hour, take them whether they need to or not.
Go through the steps each time.
Soon, you'll see what time-frames they are most likely to go.
Then you can build a routine off of that.

My son is 59 years old. It is still hit and miss.

https://www.autismspeaks.org/expert-opinion/sev...

1. Address Sensory Needs and Anxiety
Many autistic teens experience heightened sensitivity to sound, temperature, and physical positioning.

Create a comfortable environment: Standard toilets can feel large, cold, and echoing. Use a comfortable, properly fitted seat reducer and a sturdy step stool so their feet are flat.
Reduce sensory overload: If the toilet flushing sound is distressing, have them wear noise-canceling headphones, use a manual timer, or leave the bathroom before flushing.

2. Implement Habit Training and Schedules
Rather than waiting for the teen to tell you they need to go, take a proactive approach.

Timed sits: Track their natural habits for a few days, then prompt them to sit on the toilet every 30 to 60 minutes for up to 5 minutes at a time.
Increase fluid intake: Offer their favorite drinks throughout the day to increase the volume of practice opportunities.

3. Use Visuals and Clear Communication
Visual schedules: Use pictures or visual prompts (like the ones available from the Autism Speaks Toilet Training Tool Kit) to clearly map out the steps of the toileting routine.
Consistent language: Keep verbal cues simple and direct. Use the same, exact terms every time (e.g., "time for toilet" instead of asking "do you need to go?").

4. Positive Reinforcement and Desensitization
Start small: If the teen has an intense aversion to the bathroom, use systematic desensitization. Start by rewarding them just for walking into the bathroom, then for sitting with their clothes on, and finally for using the toilet.
Immediate rewards: Provide a highly desired reward (such as a preferred snack, video, or toy) the exact moment they urinate or have a bowel movement on the toilet.

5. Seek Professional Guidance
Because teens have a long-standing history of using diapers or pull-ups, the process can take longer and may require a customized approach. If you are struggling, consult with a Board Certified Behavior Analyst (BCBA) or an occupational therapist specializing in autism. You can use directories like the Autism Speaks Resource Guide to find local specialists and support in your vicinity.