Long Walk for Henry

Henry lives in a city laid out on a grid.  Laid out on a map the vertical streets are A through Q.  The horizontal streets are First through 17th.

Henry began his afternoon walk at 2:45, leaving from his house to visit a friend. For every 5 minutes he walked, he traveled north 2 blocks and east 1 block. He started on the corner of C Street and Second Avenue. He arrived at his friend's house at 3:10 in the afternoon.

Henry then spent 2 hours and 20 minutes at his friend's house. When he left, he walked to the store at the corner of K and Sixth Streets at the same rate as his earlier walk (though in a different direction). He spent 10 minutes at the store before walking home.

If he walked home at the same rate as his other walks, at what time did get home?