Very fast, even abroad.
An employee at SVB recommended UPS (the more expensive shipping option) for my shipment to Spain. The two packages were sent on Thursday, March 26th, and arrived reliably on Tuesday, March 31st. Thanks to tracking, I always knew where they were. Two years ago, I sent a package privately with DHL, which was hardly cheaper than UPS this time. Back then, the tracking wasn't seamless; the package went missing for a while and took four days longer to arrive.