I would say its a bit long, although it depends on how familiar your LO is with your husband's parents and whether you have spent time away from him before. I think you have to make sure that both he and you would be comfortable.
We recently spend the first night away from our son, who is 13 months. I knew he would be ok as he knows my parents who he stayed with well, but I was a mess, which really surprised me! There is no way I would have coped with 4 nights! I think you need to work up to that, and if you haven't, then its too much for both of you.
I agree with MR, if you aren't 100% comfortable, it won't be worth going away as you'll be miserable.
Do they look after him now?
Has he ever been anywhere else overnight?
Is he happy to be put to bed by anyone else?
Could you just have a few days where you both do day trips/stay at home and PIL look after your little one and then still have him with you at night?
Is it important to you to have time away?
We didn't and never even thought of it really, so I guess that's why we didn't miss it, but when Nate was born my mum offered to take Darcy to Sydney (we live in the country) with he so we could have time together and time with Nate. I was sooo nervous as she's a real mummy's girl. DH gave her away eagerly lol, but in the end it was me who enjoyed it the most and DH who hated it. Darcy had a great time and was as good as gold HOWEVER she was nearly 3. I doubt I could have done it and enjoyed it if she was any younger.
HTH
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