Can a sinus infection last up to ten days?

A sinus infection or clog doesn't have to last 10 days, nor does it have to be severe. Get a Neti pot, my friend, and non-iodized salt. It's very likely they will be sold together. This procedure will blow out the nasal pipes, removing the foundation of the clog. It's not pretty. You're not going to be announcing a performance before Christmas dinner. But it is effective. And, you could then use the mild insult "Ah...blow it out yer nose!"