The main reason for the "fast-food" groceries winning acceptance in Swedish culture is lack of time.

acceptance 是名词，来自动词 accept（接受、认可），加上名词后缀 -ance 构成，表示"接受、认可"的状态或行为。在这里指"快餐"杂货被瑞典文化所接纳和认可的现象。