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This is how far in advance a buffer must be queued for presentation at a given time. If you want a buffer to appear on the screen at time N, you must submit the buffer before (N - presentationDeadline).
The desired presentation time for GLES rendering may be set with Android.Opengl.EGLExt.EglPresentationTimeANDROID(Android.Opengl.EGLDisplay, Android.Opengl.EGLSurface, Android.Opengl.EGLSurface). For video decoding, use Android.Media.MediaCodec.ReleaseOutputBuffer(int, System.Int64). Times are expressed in nanoseconds, using the system monotonic clock (Java.Lang.JavaSystem.NanoTime).