Board Thread:Questions and Answers/@comment-2607:FEA8:54E0:3AB:C411:92:D9FB:9503-20180104140628/@comment-28137023-20180104141029

The training field free quests gives decent amount of them per run.

For reference on which days for which class: http://fategrandorder.wikia.com/wiki/Daily_Event_Quests%3A_Chaldea_Gate