In Tampa, we were stage right, behind a row of road cases (I think) from the backdrop to that stack of speakers you can see sitting on stage beside Phil on his right. Basically close enough for at least Phil and Mikkey to see all of us and to hear every detail of what Phil's playing.
The meet and greet itself was long enough. I'd feel ashamed to be counting minutes given the significance. The price is there to keep out some amount of riffraff.
I had the advantage of a backstage area conducive to mingling, i.e. none of the usual our side vs their side situation, so your mileage may vary. Again the limits came from the industry and not the music side, i.e. probably contracts with Rockstar or the venue primarily determine how long you have, not the band.
As always, various factors at play on the day determine the quality of your experience. Just remember that unlike other artists, Motorhead genuinely do care.