I guess it depends. I think to ask a young dog to stay on it's own all day with no stimulation is asking an awful lot.
However, there are lots of older dogs in rescues that are a bit more laid back and possibly used to beign left that could cope a little better - this said, they would still need to be let out during the day - maybe you could pop home at lunchtime, or get a dog walker - or both!
I work odd hours and have 2 dogs - they have a dog flap and have constant access to the outdoors - they also have each other - which makes a huge difference - you may want to consider getting 2 - it really is no more hassle than having one! Again, rescues do have pairs of dogs that have come in together.
But, most rescues will not rehome to a household where there will be no one in all day. But, if you want one badly enough and can make the required compromises then some of the smaller ones may consider you. You will need a home check first etc, and will have the support of the rescue to get you through any teething problems.
Try having a look here - both my dogs came via this site:
www.dogpages.org.uk
Good luck