Could be 3 weeks, longer, and radiation keeps working just as long as treatment lasted, and everyone is different. The thick rope mucus is mainly from the parotid gland producing mainly thick mucus, which as a yellow tinge to it. Radiation destroys thin mucous only, and the other produce a mixture of both.,

Sleeping on an incline may with with gagging, a steam bath may help loosen it, drinking enough water, have your oncologist spray your mouth, usevacwater IOC at home on low, the are sponge wooden stick, some pre-moisturizer to clean mouth, get in hard to reach area in the back of the mouth.

Helps cut mucus
Salt water, making soda
Frequent brushing
Tea
Beer
Egg drop soup
Papaya juice or pinapple juice
Seltzer water or soda
Meat tenderizer rinse mixed with water
Mucinex
robotusm

After feeding do not lay down for several hours, and when raising from bef, do it slowly, which my help with not vomiting.

Good luck