A day in Stardew Valley lasts from 6:00 AM to 2:00 AM in-game, which is a total of 20 in-game hours

. Time in the game passes in 10-minute intervals, with each 10-minute interval equating to about 7 seconds of real time

. This means a full day in Stardew Valley takes roughly 14 to 20 minutes of real time, depending on the source and whether you include the late-night warning period before 2 AM

. To summarize:

• In-game day length: 20 hours (6 AM to 2 AM)
• Real-time duration: Approximately 14 to 20 minutes
• Time progression: 10 in-game minutes = about 7 seconds real time
• Day divided into morning, afternoon, and late night phases, with shops opening around 9 AM and closing by late evening

If the player stays awake past 2 AM, the character will pass out and be penalized, so managing time efficiently within this day cycle is crucial for gameplay

. Thus, a Stardew Valley day is about 20 in-game hours long and takes around 14 to 20 minutes to complete in real time.