Hello Bunny Ripper,
I have a few tips that I know and have heard from others about getting up fast. Please tell me if these helped you or not.
1.) Buy an IP Boost - Riot Games has been courteous enough to make certain small duration IP Boost very affordable for the player. These IP Boosts give you bonus IP (Depending on your game). Combined with the normal earnings from a single/multiple games, this IP Boost will slowly (but in large amounts) stack up your IP earnings/total.
2.) First Win of The Day Bonus - The FWOTD Bonus gives you 150 IP no matter how well you performed in-game. The key is...you have to win. This bonus also resets every 24 hours meaning that it is readily available to you sometime throughout every day. Here's what I do to fully take advantage of the FWOTD Bonus. Once the bonus becomes available to you, enter an intermediate bot match. Since these are bots you are almost guareented a win. This should give you 50 IP buy default. Combined with the FWOTD Bonus, you should easily get 200 IP for very little time and effort consumption.
3.) Game Duration - IP awards/per game are pretty much based on the duration of your game. If your FWOTD Bonus has been used, then Game Duration is key. This will take more effort and time consumption than a FWOTD Bonus + Bot match, but the IP is still pretty decent. A 55 minute game will get you the most IP (set amount) without bonuses or whatnot. So, if your about the clear nexus and the game is at 52 minutes, convince your team to hold off (but still win) until 55 because you will receive more than if you ended it right there and then.
I hope these tips help you in your quest to earn IP faster. Please inform me if these tips helped or not.
Thank you...
-RandomLaner 