HOW LONG WILL IT TAKE TO GET 1800 IP

You can expect an avg of 90 ip in an avg length Summoner's Rift game. If you play bot games (lower ip gain, but almost guaranteed win), you can prob get around 200 (150+50) for an avg length bot game, so 9 days if you just play the one. Get your first win and one other game, and cut it to about 6.

Not that long really if you play a decent amount.

you must be poor rofl

About a week and a half if you only play for Win of the Day. 25-30 games otherwise.