I don't think there is a standard. I generally produce very little, so 5ml is lot. The real question is how do you feel after your airway clearance? There are some techniques, are you a member of lung matters on facebook?

Somewhere I saw a bronchiectasis rating chart where you get 0-3 points for variables related to bronchiectasis (sob, sputum production, energy, sleep quality, co-morbid conditions, age, etc). The amount of sputum gets a score and the ratings were something like: less than 1 tsp, greater than 1 teaspoon, or less than tablespoon or greater than tablespoon -- don't quote me but it was something like that. I'll see if I can find the original document.

Bottom line, it seems, is that the severity of bronchiectasis is based on several factors, not only the amount of sputum produced. In the mornings I produce around 5ml and when I have an exacerbation it's greater than that but less than 10ml. This bronchiectasis with no NTM/MAC. Maybe those with MAC or other infections produce more?

When I am fresh from an immunoglobulin infusion for specific antibody deficiency it's much less around 1-2ml but honestly I haven't measured it!

Found it! Australian site. Not sure how much traction it has gotten in US.
https://bronchiectasis.com.au/assessment/medical/bronchiectasis-severity-index
PS - doesn't mention sputum amounts....must be in another study somewhere