Keep in mind that scans only tell us the last place an item was known to be, not where it is now. I doubt your item is lost. However, there seems to be a lot of things that can trip up a shipment handled by the eBay International Shipping program if the seller hasn't prepared the item properly or if hazmat (particularly lithium-ion batteries) is involved. Unfortunately, if your item has dead-ended because it's unforwardable, there isn't always a scan that reflects this situation. Having said that, there are items that do seem to spend a lot of time hanging around the eIS hub or the DHL eCommerce centre or with Asendia before they start moving. My guess is that the carrier is waiting for enough packages to accumulate to make a consolidated shipment as economical as possible.
I came to the conclusion a long time ago that watching tracking information was a mug's game. It didn't make the item move any faster or ensure that it arrived damage-free. It gave me the illusion that I had some control over the shipment which I don't have. So I've stopped checking the tracking for my orders and made note of the last estimated delivery date instead (as you've done) and just gone about my business until then. What happens or doesn't happen to the shipment in the time between my purchase date and the last estimated delivery date is largely immaterial.
To answer your question: There really isn't a "normally" when it comes to eIS-forwarded shipments.
