How wide are Vertical Blind Slats ?

Q : How wide are vertical blind slats ?

Answer :
Typical size : 3.5 inch / 89mm
Bigger size : 5 inch /  127mm

note : UK sizes

Most homes probably use the standard width size of 3.5 inch slats
My ebay search suggest the 2 width sizes above are the sizes on offer by default.
My answer is for the UK but I guess this is typical for many countries.

Fastest USB mains charger

Q : How fast can a USB mains charger be ?

Answer :
My ebay search for a 5v dc charger suggests a current output of 4500ma 

Standard specs for small device USB charger :
5v dc
current output varies up to 4500ma ?

The 5v DC stays the same so the current size will seem to make it charge quicker
My ebay search suggests the present typical current output sizes on 5v dc charger are :

current output :
500ma (slow)
1000ma
2100ma
4500ma (fast)

Device warning :
I'm assuing the device may have a limit to it's max. current so maybe some devices won't charge at 4500ma but the USB charger will probably just lower the current automatically.

Note : more devices connected divides the current
If your charger has 4 ports and 4 devices connected, current will be divided by 4

example :  
4 devices charging on 2100ma 5vdc charger
current to each device will be 2100/4 = 4 times slower to charge

My knowledge on subject :

sketchy 

USB mains charger : why does it slow ?

Q : Why does my mains USB charger take longer the more devices I connect ?

Answer  :
It divides the current between the number of things being charged.

Example
4 devices on a 2100mah 5v charger
current to each device = 2100/4 = 4 times slower charging