If it takes your organization 8-10 years to build a cup contender no matter what shape you inherited at then you didn’t do a good job.
Ask Chicago - from 1997-1998 through 2007-08, they made the playoffs once. Two years later, won the Cup, then twice more in a six year period.
Pittsburgh made the playoffs once in 8 years before winning two Cups. Missed the playoffs 4 years, then in their third playoff season, won the Cup.
TB made the playoffs once in their first 10 years, then won the Cup in their second visit to the playoffs. Made the playoffs once in 7 years, then two years later lost the SC finals.
St Louis made the playoffs once in six years, then spent six years never getting past the 2nd round, missed the playoffs and finally won the Cup.
Kings missed the playoffs six straight seasons, lost in the first round twice, then won the Cup.
6-10 years isn't that uncommon, a few franchises manage to reload rather than rebuild, but that's hard to sustain over a decade with the hard Cap. It was easier a couple decades ago when the rich teams could buy their way out of mistakes.