https://www.polygon.com/2019/1/11/18179100/epic-games-store-refund-policy-steam-pc

The Epic Games Store has updated its refund policy to one matching the terms of the Steam marketplace, providing for unconditional refunds of games within two weeks of purchase and less than two hours played.

The news came this morning on Twitter from Sergey Galyonkin, Epic’s director of publishing strategy. For pre-ordered games, the return window is until 14 days after the game’s launch date. Both the two-week timeframe and two-hour trial period are features of Valve’s return policy, which it implemented in June 2015.