Twelve‐h shifts can facilitate 24‐h service provision and are often implemented in pursuit of financial goals. Existing evidence on the benefits of extended shifts is mixed. This study examines the impact of extended shifts on employee strain in a large mental healthcare organisation in England. Semi‐structured interviews were conducted with nurses and healthcare assistants at 6 and 12 months intervals (n = 70). Findings illustrate how extended shift patterns have a profound negative effect on high demands already confronting mental health staff, shaping spillover of strain. Analysis contributes to development of strain‐based work–life conflict theory by conceptualising spillover as temporal and iterative. We argue theory should differentiate between retroactive (backward facing) and anticipatory (forward facing) spillover processes. Using context as a lens and identification of new dimensions to strain‐based spillover aids interpretation of differential effects of extended shifts across settings. The study discusses implications for organisations, recovery and scheduling of shift work.

中文翻译：

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长期轮班对基于劳损的工作与生活冲突的影响：对背景在追溯和预期溢出的时间过程中的作用的定性分析

十二小时轮班可以促进24小时服务的提供，并且通常是为了实现财务目标而实施的。关于长期轮班的好处的现有证据好坏参半。这项研究探讨了长期轮班对英国一家大型精神保健组织中员工压力的影响。每隔6个月和12个月对护士和医护人员进行半结构式访谈（n= 70）。研究结果表明，扩展的轮班模式如何对精神卫生人员已经面临的高要求产生深远的负面影响，从而造成劳累的溢出。通过将溢出概念化为时间和迭代，分析有助于基于应变的工作-生活冲突理论的发展。我们认为理论应该区分追溯性（向后）和预期性（正向）溢出过程。使用上下文作为镜头并识别基于应变的溢出的新维度有助于解释跨设置的扩展班次的不同影响。该研究讨论了对组织，恢复和安排轮班工作的意义。