In my opinion, yes, your Grey would know that you spend time with him a varying amounts each day.
That's the same routine that happens for ALL us working folks, were gone 5 days a week for most the day and then on weekends and holidays it party-time!!
I am sure others with much more experience than I have will pipe in here :-)
Here are the results of a search I did in MN. I do not know how close any of these may be to You http://www.avianbiotech.com/Breeders/Search_Breeders.asp
12 Listings found! Page 1 of 1
Listings Contact Business Location
0 Dave - Minnesota
2 jeff borchert - Owatonna
Minnesota, 55060
3 jeff borchert tri-birch-farms Owatonna
Minnesota, 55060
0 joe kirsch - Glenville
Minnesota, 56036
0 John Alstrup - Rice
Minnesota, 56367
0 Juanita Heckman Feathered Cuddlers Fairmont
Minnesota, 56031
0 MARIE BLOMBERG - Shevlin
Minnesota, 56676
0 mary kidd marykidd Anoka
Minnesota, 55304
0 mgaviary MG aviary Minnesota
0 Sandy - Cold Spring
Minnesota, 56320
0 Tammi Reilly - Stanchfield
Minnesota, 55080
0 TweeteBirds Tweetebirds Owatonna
Minnesota, 55060