See, I am in two minds here 
I recently changed my working hours, albeit I work two days a week, through choice.
So, on my working days, DH gets up with Ddog at 6am and they spend half an hour in the garden training. I then take Ddog out for an hour at 8am, we meet friends with dogs and they have a romp. I leave for work at 9.15 ish, and now get back about 2/3pm. Ddog is over the moon to see me, but there is no sign of behaviour that would indicate distress.
I don't even put the kettle on, I just grab the lead and off we go for an hour to 90 minutes over the fields, I usually visit Dpony, so dog gets to romp further with the farm dogs and eat poo 
He's then with us for the rest of the day and evening. On my days off, I can pop out for a couple of hours, but generally no more. DH takes him to dog training on Saturday mornings and he passed his KC Gold last week at one year old and I am very proud of this tbh! I suspect however that, should I work more days than two, because he has this routine, he wouldn't actually suffer.
Everybody I know without exception, laughs at how much we 'give' our dog. Most of the dogs I know get left most days and are happy, well behaved and well adjusted.
So, no I don't see how giving an older dog (it MUST be the right dog) a secure home, would be preferable to kennels?
If you turn it round, would any of you suggest I rehome our dog, where I feel he is loved, trained and secure, as he is left for 5/6 hours two days a week? I honestly don't think so, even though it's not ideal?
As I said, it must be the 'right' dog though.
Good luck OP, I have had a bit of a time adjusting to having a dog, but wouldn't be without him now.