I have received many things from eBay that came all the way from England, Portugal, Japan, Hong Kong and many countries far away.
To give you an estimate time frame window, and since 1st class is a bit slow, allow 14 days for delivery. If you are extremely lucky it might get there in 10-11 days. But maximum, it can take up to 18 days or so, when the postal service has lots of packages to send (like for mother's day).
I really wish you luck and hope your package gets to its destination safely.