I think this tip failing this soon is an outlier - it still looks practically new aside from some discoloration further up the shaft.
I think my use is relatively sparse, so I suspect even a Chinese tip would last me for many years. I've had my pencil iron for over 10 years.
I now have ordered 4 more T15 Hakko tips - the tips I should have already and had intended to buy in the first place.
Replaced the D16, added D32, D08, BLL, and an SB05.