This article examines how platform workers providing food delivery and domestic services in Belgium engage in contentions over unpaid labour time. Drawing on theories of organisational misbehaviour around the ‘wage–effort’ bargain, we explore how workers reclaim some control over their income by contesting their exposure to unpaid labour time. Based on a qualitative analysis of two labour platforms, the article illustrates how platforms’ systems of time control expose workers to unpaid labour time through work extensification (that is, food delivery) and work intensification (that is, domestic work). It also indicates how workers contest platforms’ control over unpaid labour time by developing various practices around platforms’ systems of control. Food delivery couriers increase their income by cutting down on unpaid idle time, while domestic workers try to improve their access to clients, jobs and pay which sometimes entails intentionally prolonging their unpaid labour time. Thus, we argue that examining workers’ contentions over unpaid labour time contributes to a better understanding of how workers can develop a sense of agency in a context of exploitative platform work by actively navigating and purposefully using their exposure to unpaid labour time to regain control over their income.