I work full time and my partner works abroad 6 weeks at a time.
This is how we juggled 2 puppies when he went away...
1st pup -
Partner was home for 2 weeks when we brought her home so she settled nicely, we crate/kennel trained her.
When he went away and I went to work, we hired a dog walker/dog sitter who took her for a few hours every day (not walking, she would take her a small walk and basically pup would chill at her house for a few hours) and then she would have a couple hours in her kennel/crate before I came home.
When left alone she was either in her crate or outdoor run with kennel where she could pee/poo outside if needed and had plenty to look at and keep her occupied.
2nd pup came along 2 years later - We did the exact same she went along with the dog walker every day while I was at work and spent any alone time in her outdoor kennel and run alongside her sister.
now they are 3 and 5 their week looks like this
Mon to Fri - 6.30-7.30am walk
8am I leave for work
5pm I return and they get another hours walk. (All year round, I'm the only nutter walking around with a headtorch in winter)
2 days a week I have a dog walker who takes them out from about 11 till 12.
I have recently started to WFH. I realise all my dogs do all day is sleep 🤣
So 3 days of the week they are left outside in a kennel and run for 8 hours. I have cameras on them and they literally.just.sleep.
They spend all weekend with me and are very rarely left on a Saturday or a Sunday.
Alot of folk are soft when it comes to dogs and leaving them alone.
Think about working dogs, they don't work 24/7 so they have alot of downtime too. Depending on season they can be out of work for weeks and do very little.