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Is there an option to increase the maximum no. of days a customer can pause the subscription?
There is an option to set a 90-day maximum limit to pause a Subscription. There is no way this can be overridden in the backend as well. This is the defined amount. This is due to logs being stored only for 90 days.
As a workaround, you can do either of the following:
1. Use Pause Subscription API by passing the resume_date
2. Choose Pause Indefinitely from Admin Console/Chargebee UI and set the resume date or resume manually.
Related articles and Documentation
What happens to Subscription & Other entities once Subscription is paused
Extend Pause date