I don’t know. For my own storage node I am not upgrading my internet connection up front. In my case my ISP needs just a few days to upgrade me to a higher profile.
How about a TTL between 1-8 weeks? That would mean you need enough bandwidth to write between 25% and 200% of your free space per month. With my 100MBit/s connection I can write up to 32 TB per month. With a TTL of just 1 week that would mean 8 TB used space on disk and a 8 TB payout. With a TTL of 8 weeks I would cylce through 64 TB of disk space.
As I was going through these numbers my first reaction was “holy shit such a tiny payout for 100% bandwidth usage. That 1 week TTL must be a joke.” Later I realized that for additional 30€ per month I could go up to 1 GBit/s. That would be 320 TB to transfer and up to 80 TB payout even in the worst case with 1 week TTL. And there are some benefits to it. Instead of trying to grow my storage node over years I can get a decent payout in a short time.
Ok enough of the dreaming. I am sure these numbers are wrong in multiple places. Please do your own calculation for different TTLs and maybe don’t make the mistake to calculate with unlimited demand like I did now. There will be an announcement with way better numbers. I kind of feel bad to share my numbers with you so early on. Please wait for the official numbers before making any decisions. I don’t trust my own estimations enough to make any decisions myself.