All shipping services are painfully slow at the moment.
Between workers calling in sick (and USPS workers actually have sick leave) and safe distancing measures, there are backlogs all over.
You have no worries. The GSP will also be slow, but you are protected by eBay's Money Back Guarantee, Paypal's Buyer Protection, and the chargeback policy of the credit card you back your PP account with.
Mark the last estimated date for delivery on your calendar and don't worry until then.