Q: Music memos recording 53 min, doesnt load.

I suspect your recording is too long to be processed properly. It may help if you close all open apps and/or reset the device, or even remove some apps or media to release more working memory for Music Memos to use when working with your file.

tt2

There is no maximum record length documented for Music Memos, but GarageBand on iOS has a maximum record length of 320 bars.  At the minimum tempo of 40 bpm you could have 10 bars per minute with a 4/4 signature, and record no longer than 32 minutes.

I'm not sure if this limit still applies to the current version of GarageBand iOS, but that is the last information on the record length I could find. If this limits still holds, GarageBand will not be able to open a 53min memo.