Everyone is different in their relationship with strings. Different people's playing can erode a string at different rates. Plus what one considers dead another may think is in the sweet spot.
For me the Gamut Gut plain strings lasted about 6 months before I want a new pair. For someone else they could last 6 years.
yes, there was a post the other day, he had lent out his bass with gut strings and it came back with the strings unravelling, the heavy hand struck again...
but UT, what was it that changed for you at 6 months? did they lose tone, were they fraying and shedding hair? for me they were just settled in at 6 months...
ymmv, imho, fwiw.