How far is it between terminals at McCarran, I'm arriving from Gatwick and want to go to a shop in T1?

McCarran Airport is not that big compared to Gatwick or Heathrow. You can easily walk to Terminal 1 from any other terminal. 15 min. walk easily.

Terminal 1 is the main one, 2 used for some international flights. You cannot walk between the two main terninals but can between Gates A B C D, which are all in T1. Check www.mccarren.com for and they have layout

You have to walk outside but it isn't a real far walk however you won't be able to shop in T1 because you will not pass the security check point. You have to have a ticket for an outbound flight at T1 to get past security and all shops are after security. Sorry.

The monorail is a couple of minutes walk from the terminal. Time spent in risk-free practices? Hmm. Very variable. The numbers of team on duty look to variety. Friday is frequently a hectic day

Here's a link to the terminal diagram. There's no scale, but you can get an educated estimate.

http://www.goingtovegas.com/kpv-air.htm

To me, it doesn't look like it's much more than about 400 feet (130 meters).

There is a free shuttle that takes passengers between terminals.