Big maps download

I bought a new venu X1 Friday.  Today, at work, I connected it to my computer to charge it.  Garmin Express came up automatically so I added this watch (had a Venu 2).  It asked to update and so I clicked to do so.  It's a 3 hour download of maps.?.  Should I let this continue?  Sounds like an awful lot of date to put on a watch.  

Hmmmm.