I order lots of small bits on AliExpress and delivery times vary - 20 to 30 days being typical. The stuff that disappears most often is the small desirable stuff like novelty items for kids. Engineering stuff like cutters don't seem to get knicked in transit.

The thing that bugs me is the way UPS slap on 'processing charges' of at least another £8 for paying the import charges and VAT for you before they will deliver to you. I bought a 3D printer twin extruder assembly from Wanhao in China and it cost £75, but by the time UPS delivered it it was £140.