I don't think it is a big issue with your husband going for days. In 2020 I was given a conditional job offer as a Corrections officer 4hrs away from My city,this job also needed Me to be gone for a whole week. In My state,you need to be a citizen before you can be a CO so when they realized at the final background check that I wasn't,they didn't move to the next step. That being said,your husband being away for work will not affect your immigration journey as long as your marriage is genuine you can sleep without fear. I was worried about many things too during this journey but everything was smooth. At My interview the officer asked just 3 personal questions to Me and he was very happy I answered them without hesitation,the questions were,spouse's name,spouse's dob and our date of marriage. USCIS has all info they just need you to be truthful, when we filed we had not bought our home yet and I never mentioned anything to them,apart from notifying them about change of address,but they already knew We bought a house without us telling them. They may or may not show up at your home but during any interview,be truthful,it doesn't hurt.