What is the longest time limit for iphone ringtones?

There is a time limit for iPhone to play ringtones, up to 40 seconds. Mobile phone models and brands will be different in different periods. I hope it works for you.

Ringtone, in the traditional sense, refers to the ringtone of class, but now it refers to the ringtone of mobile phone. Ringtones can be divided into MID ringtones, WAV ringtones and AMR ringtones. In the traditional sense, the bell rings. Cell phone ringtone refers to the sound of previous omen when an event or thing is about to happen. A ringtone is the sound that reminds people of a phone call when it comes in. It turns out that most ordinary MIDI ringtones are made by ordinary speakers.