It takes a few days
it can take 6 weeks or more, but after 90 days they have to return the shipment by customs law.
i received also shipments between 4 and 7 Days, so there is no consistency.
Some facts:
DHL/Post policy is to carry´s no guns, no ammo and no gun parts, but you have no choice when
you choose something else than express. Often they return such goods without notice 
By the way, EMS is express, they always ship in time to
Frankfurt, but DHL/Post normaly slows down the process.
Claims are a pain in the ass.. they f^^k you with their policy.
They got bombed with parcels on a daily basis, there is by far not enough staffing and
the processing and customs clearance is a bit "shady" sometimes.
Good for us, so a lot of stuff is processed by "plausible inference"; weight, size, declaration and value is coherent, shipment gets a pass, sometimes with COD Tag, sometimes without....
But there is a difference between some random parts or stuff in shape of a gun or gun parts, if they got screened. 
I am in the import business for a long time and i order my stuff worldwide and there is a reason why i choose UPS, FEDEX, DHL EXPRESS.
Yes, its expansive but i have no headaches, because i can provide information for customs clearance pro active and i get my stuff in time.
And needless to say, that i´m not very patient 
