So I just wanted to put this here , but this issue I solved myself.
When Exporting audio, the max I could get for some reason was just over 3hrs and I needed 10 (continuous) for a lounge. I tried literally every file type and couldn’t figure out why, read through a bunch of posts here and to no avail. I was saving it to an external TB HD (which had 1.74 TB of space left still). I was selecting all the audio and was clicking “Export audio” and “Export Selected Audio”.
What SOLVED it for me.
I unselected everything, put my cursor at 0:0:00, Put the save location as my desktop, then hit “Export Audio”. Full Mix was bounced out in mono.