It won't take longer than a quick play match and you can always choose a harder difficulty from the workshop settings for a longer grind.

This sounds complicated but, don't worry, you can go through a quick tutorial explaining every element of the game.

You win by buying the nuke, the first to reach enough gold to buy a nuke wins!

The most effective method to gain gold faster is by maxing out gold upgrades from the start.

Jinko likes it.

Sure, just get the first place playing with at lest 3 other players, take a screenshot of the scoreboard and send it to @akmt9 on Discord and you will be added to the notable members list that will give you free starting gold every match giving you an unfair advantage