In all honesty, I dont have a clue. And 4give me 4 bing blunt but, y wood it matter? Day or nite? I shood imagine these voice recordings wood take place during the mornings and continue thru til the afternoon if not evening. Saying that it's probably easy 2 assume that not evrything will b fulfilled on the 1st day of recording. From amateur experience, voice recording usually takes more than a single day 2 capture evrything 2 a satisfactory standard.