When does the penis have the longest erection?

Typical duration of an erection depends on the situation and the person. There is no single time when the penis always has its “longest” erection, but the longest-lasting erections commonly occur in two contexts:

• Nocturnal erections (during sleep): Men normally have several erections during REM sleep that can last 10–30 minutes. These are physiological and often longer and more sustained than brief daytime arousals because they’re driven by automatic brainstem processes rather than immediate sexual stimulation.

• Pathological prolonged erections (priapism): A painful erection lasting longer than about 4 hours that occurs without sexual arousal. Priapism is a medical emergency because prolonged erections can cause permanent tissue damage. Causes include certain medications, blood disorders (like sickle cell), recreational drugs, or injury.

For everyday sexual activity, erection duration varies widely with age, health, medications, psychological state and stimulation; there’s no fixed “longest” time that applies to everyone.

If you or someone has an erection lasting more than 4 hours, seek urgent medical care. If you have concerns about erection duration, frequency, or changes, consider speaking with a healthcare professional for evaluation and treatment options.