~I am a body piercer with a business license. I want to work locally in a shop and pierce.
You probably didn't read far enough back in the archives here that the Migration Advisory Committee (i.e., one of the Home Office's think tanks) has been commissioned to propose whether T1/T2 spouses should be permitted to take employment, and if so, should it be in a shortage category only.
If they go ahead with these things, you'll need to be sure that body piercing is a shortage occupation in the UK. But since body piercing is de rigueur for every slapper from Zara Phillips on down to the local chavs, I would reckon it's not going to be on the shortage list.
What this amalgamates to is the aspirations you have may be dashed before you even arrive by stuff that's happening in the background. Of course the MAC might turn around and say it's great for T1/T2 spouses to work at any occupation they want. So who knows. Just don't get your hopes up.
On the hubby's front, the T2 ICT bands are pretty tight. Amazon is approved for migrant intake, so I would have him double check to be sure he's in an applicable band. It can get tricky if he's not high enough up the ladder.
To your question about how long it takes, about 90% of the work is on the sponsor's back. Once they issue your hubs a COS, the rest takes about 2 weeks.