Well, it really depends on what kind of detailing you're looking for. If you just want a quick wash and vacuum, that might only take an hour or two.   But if you want a full-on deep clean with waxing and polishing, that could take several hours – maybe even all day!   Of course, different detailers work at different speeds, so it's hard to say exactly how long your particular service will be. The important thing is to find a detailer whose work you trust and who can give you an idea of their timeline upfront.