When do you give up?

Stop trying? I'm trying to make a whole wheat dough. It's winter. It's cooler in the house. Cold really. It's whole wheat; tough to rise. The dough is showing signs of rising, but it's taking hours longer than it should.

Promise versus tossing it and starting over or not starting again and calling it a wash... The fighter in me says, one more try this time with more feeling.