eBay – How to Add a ‘Buy It Now’ Price to an Auction

eBay cannot remove the limit and leave it open ended. That idea is unheard of. Some manufacturers offer lifetime warranties on their products, but otherwise all retailers have limits on when an item can be returned and a sale can be reversed. You believe the 45 day limit is silly because you waited 50 days. If it was a 50 day limit, you would say it was silly if you had waited 60 days. There has to be an arbitrary amount of time, and it was decided that 45 days was enough to determine that a product has not arrived/been shipped/had an issue occur in shipping... and start the ball rolling on establishing a solution with the seller. The fact of the matter is that you should have brought this to the attention of eBay much sooner. You cannot avoid your responsibility in this, regardless of how you phrase it.

I agree that 30 days for shipping is reasonable. At which time, you should have been in contact with eBay, not waiting an additional 20 days.

I ended up ignoring the warning about not being able to post my listing and clicking the "List it" button anyway, and it seems to have gone through. So maybe the warning was displayed by mistake, and everything is fine? If I discover otherwise, I'll follow up here....