Unfortunately that's the maximum number of days that can be within a subscription at Stripe. So you may need to adjust your plans to be within the limitations of that. Stripe allows for the following intervals.
days, weeks, months, years
The maximum values for those are as follows.
days = 365
weeks = 52
months = 12
years = 1
Each payment provider has its restrictions and unfortunately this is Stripes. I'll see if I can workaround this using a Subscription Schedule in a future release, but I can't guarantee that'll be a solution. Basically it'd create multiple payment plans at Stripe and chain them together to reach the necessary total.
forge.joomlapolis.com/issues/9187
I don't have a timeframe for this or guarantee it'll be able to handle breaking up the subscription properly. Will try to prioritize implementing this sometime next week if it's possible.