S.J.
Hi Jen,
First, I would say that waiting, if it can wait, probably shouldn't be longer than a time out and at his age, that means about a minute.
Second, sounds like your husband is unrealistic and needs to save his stories until the baby is in bed. From now until your children quit talking to you (when they turn somewhere around 12), they may need your attention. Your husband is the grown up and needs to be able to hold his train of thought or understand that you can get a cookie and listen at the same time. He doesn't need your undivided attention for you to be able to hear him. If the baby is interupting you to say he has to potty, long before your minute is up, he will have peepeed on your floor.
I think all husbands would like to be the center of attention at all times, but you're both parents now and sometimes we have to readjust. What are you going to do if you have another child? The childisn't stilting the communication, the husband is. I went through it with mine, too. You have to explain to them that you CAN do 2 things at once and that he's going to have to be the groown up and either wait the baby is in bed or tell you while you contunie doing whatever needs to be done.
Good luck!