I was mostly concerned about time from receiving the tracking number than the time since I placed the order. Sounds like it is normal but it is by far the longest I've waited between getting a tracking number and it becoming active (still waiting). Not a complaint, you gotta do it the way the world works etc. Just different enough to make me want to check in often for any issues as well though.
I'd also expect, since it is a DHL provided tracking number, that their system would at least show 'awaiting parcel' or something other than simply acting like it doesn't exist, but that's them. Other carriers tend to do that within a day or so after the number is generated.