Absolutely don't do it if you feel uncomfortable leaving for that amount of time and if you were leaving her with extended family/babysitter I would leave it at that.

However, how does your DH feel? I know mine would be upset at the prospect of being not an "equal" in caring for one of our children once they were not solely reliant on breastfeeding/could satisfy their food/fluid requirements in other ways. Whilst he couldn't comfort with BF, he had/has his own techniques for soothing them iykwim?