Question about database retention

We have checked the following link about recommended server and database settings:

We have some doubts about the database retention period. For example, for ‘Tracking 100,000 page views per month or less’, is recommended a storage of 50GB. Considering that we keep this monthly page views tracking average forever, how much time would be necessary to exceed this 50GB of storage?

I think this is based on a retention duration of 1 year…
Then 50 GB per year.