I know what I would NOT do ... that's leave her in the car while you hike.
Is there any reason you can't leave her at home? What do you do with her during the work week? Does she stay home? Does she have a crate?
I personally don't think that 3-4 hours is too long to leave her at home as long as you give her plenty of exercise before you go and make sure she's gone potty.
Do you have a neighbor that could look in on her, if that would make you more comfortable?
Is there any reason you can't leave her at home? What do you do with her during the work week? Does she stay home? Does she have a crate?
I personally don't think that 3-4 hours is too long to leave her at home as long as you give her plenty of exercise before you go and make sure she's gone potty.
Do you have a neighbor that could look in on her, if that would make you more comfortable?