What does predictedDisplayTime in Meta Depth API EnvironmentDepthFrameDesc means?

{'isValid': True, 'createTime': 0.0, 'predictedDisplayTime': 79603507982894.0, 'swapchainIndex': 2, 'createPoseLocation': {'x': -0.1154637336730957, 'y': 1.0762470960617065, 'z': -0.05503325164318085}, 'createPoseRotation': {'x': 0.11832347512245178, 'y': 0.9198459386825562, 'z': -0.05764325335621834, 'w': 0.3695405423641205}, 'fovLeftAngle': 1.376381754875183, 'fovRightAngle': 0.8390995860099792, 'fovTopAngle': 0.9656887650489807, 'fovDownAngle': 1.4281479120254517, 'nearZ': 0.10000000149011612, 'farZ': inf, 'minDepth': 0.0, 'maxDepth': 1.0}

I create a system that get the EnvironmentDepthFrameDesc using GetEnvironmentDepthFrameDesc(targetEye). But I don't understand what does the predictedDisplayTime mean. It is usually a very large number. Even if the unit is nanosecond. it is still very large, like 79603507982894.0 (about 22 hours). I don't know is it is related to the previous bug shown here (https://steamcommunity.com/app/250820/discussions/8/2647504242049377020/?l=thai). Or is there some misunderstanding I have on this variable.