How long can an iPhone record a voice memo?

iPhone's Voice Memos has no hard time limit on recordings — it records until you stop it or storage runs out. Here are the practical numbers.

Standard quality (.m4a, ~64 kbps):

• 1 GB ≈ 36 hours of audio
• 5 GB ≈ 7 days of audio
• A 128 GB iPhone with 50 GB free can record ~70 days continuously

Lossless quality (Settings → Voice Memos → Audio Quality → Lossless):

• 1 GB ≈ 1.5 hours
• 5 GB ≈ 7.5 hours

Practical limits:

• File size cap of ~4 GB per recording for compatibility with older iOS file system handling. At standard quality this is ~24 hours; at lossless it's ~6 hours.
• Battery — recording with the screen off uses ~3-5% battery per hour on iPhone 15+. A full charge gives you ~20-30 hours.
• Phone calls interrupt — incoming calls auto-pause the recording. It resumes after.
• Screen lock is fine — Voice Memos keeps recording in the background indefinitely.

For very long recordings (5+ hours), use these settings:

• Plug in a charger.
• Lossy quality (default) for storage efficiency.
• Enable airplane mode if you don't need calls — saves battery and prevents call interruptions.
• Disable Focus modes that might silence the app.

Alternatives for long sessions:

• Apple Notes voice recording — same on-device transcription, but tied to a note for context.
• Némos voice notes — handles unlimited length, transcribes on-device, syncs across devices, lets you tag and search.
• Dedicated meeting apps (Otter, Granola, Notta) — designed for 1-3 hour meetings, with speaker labels and summaries. Subscriptions $15-30/mo.

For most people the answer is: "as long as your storage allows." The 4 GB file cap and 24-hour ceiling rarely matter in real life. If you find yourself bumping into those limits, you're likely a journalist, podcaster, or researcher, in which case a dedicated tool is worth the cost.