Fastest way to get IP for champions without IP Boosts

Currently I cannot buy IP Boosts or spend any actual money. Is there any way to get IP fast or do I need to put in a lot of work for it?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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