I remember having this worry - wanting a puppy and knowing we could give it a great home but that we worked full time. I delayed my decision to finally get a puppy for around 18 months because of this but then contacted a dog walker. It cost me £200 per month and was worth peace of mind, but because we were having regular holidays I was also paying £320 every few months for Tilly to go to pet sitting for her hols, and along with grooming, food, pet insurance etc I felt it was a massive expense for a pet we adored obviously, but that we were still struggling to fit into our evening / weekend routine.
I think what I'm trying to say is that I personally do not know how people work full time, plus travel time and have the stamina to deal with a dog's needs day in day out, in addition to family needs, household chores, shopping etc. Our dog walker was providing the bulk of the walking through the week and our walks were short and sweet other than on a weekend, so if I'd had to walk Tilly 'thoroughly' on a morning and a night on top of everything else, it would have been too much for me.
I hope you can sort this out, there is a way.