What's the difference between 時間がいる and 時間が必要? In this thing I'm reading, I see the following sentence: > **** The speaker is talking about a long standing problem that the protagonist has. It seems like it's , but is there any nuance difference that would cause the author to choose to use that instead of ?

There is no significant semantic difference, but is a wago and is a kango (Sino-Japanese word). This means sounds relatively stiffer. While is also a perfect choice here since she is talking about something serious, is mainly used in most casual daily conversations. Perhaps is closer to "need" or "want", is closer to "require".