Neal was what you might call 'the walking dead,' at least currently. And probably for the next couple of months, until Nikolas got on more of a regular sleeping pattern. But he also had this thing referred to as work, which meant earning money - with Emma on maternity leave, he was covering for her at the ranch as much as he could and also splitting up her duties with the animals between the other ranch hands as well.
It was a lot of scheduling and admin stuff. Hence why he was actually in his office when the phone rang (as opposed to out bottle-feeding baby cows, he had a lot of practice bottle-feeding lately), and it didn't go to voicemail or the secretary.