Hi @Chatrat1,
Thank you for posting in the community. I understand how important it is to you to hold a temperature indefinitely in your thermostat. I'll be more than glad to help you.
At the moment the maximum time to hold a temperature is 24 hours, but instead of holding the temperature, you can try to set schedules with the temperature you want, and it will automatically keep the temperature all week.
In the meantime you can take a look at the following article: Nest thermostat temperature schedules
Let me know how it goes and keep me posted.
Best regards,
Derick.
