Nuggets general manager Calvin Booth knows championship windows are fleeting.

He was there the past two campaigns when debilitating injuries to Jamal Murray and Michael Porter Jr. robbed the Nuggets of two golden opportunities to make history. With the team finally healthy this season, Booth was in charge after Tim Connelly’s swift exit to Minnesota and tasked with shepherding the franchise to heights unknown.

As soon as he inherited the job, he felt the weight of realizing their vast potential around Nikola Jokic. It was his job, he said at the time, to make sure these years weren’t squandered and these opportunities were maximized.

That’s why, in trading for Kentavious Caldwell-Pope, signing Bruce Brown, drafting Christian Braun and Peyton Watson and even attempting to improve the roster at this year’s trade deadline, Booth was so aggressive. He had very recent evidence of how fickle these openings can be.

Monday night, when the Nuggets seized their first championship, the 6-foot-11 Booth towered over almost everyone else in the victorious home locker room. Like a proud parent, he stood in the middle of it all, adorned with championship gear and black champagne goggles draped around his neck.

As he started to expound on what the moment meant to him — and the expectations he had for the organization moving forward — another bottle of champagne erupted behind him. Once the bubbly faded, Booth set the bar higher than it already was.

“I don’t think anybody’s satisfied,” Booth told The Post. “We know we have so much more to go. This is not the peak for us.”

In what was clearly an organizational mantra, Booth echoed what Nuggets coach Michael Malone had crowed from the championship podium after their win. Yes, Malone has a sense of timing and knew quite well what adoring fans would want to hear. But in far less visible moments, it’s the same pervasive attitude Booth has conveyed.

“We gotta give ourselves a chance to be in the Finals every year,” he said. “If we’re in the Finals, we have a chance. I don’t expect us to win it every time, but we gotta try to get here.”

That means being aggressive with draft picks and making prescient, if not cost-conscious, moves in free agency. That means panning the league for undervalued or misused players. Consider both the Aaron Gordon trade, which Booth was heavily involved with, and the Brown signing. Neither player was playing anything close to the role they have with the Nuggets in their previous situations. Gordon was a lead playmaker. Brown was a forward. Booth’s vision helped make them pieces of a championship roster.

Since the Nuggets are already over the luxury tax, Booth won’t have much maneuverability in free agency. A source told The Post that the Nuggets were trying to use one of their 2024 first-round picks, the second acquired in a recent deal with Oklahoma City, to move up in this year’s draft. Depending on what happens with Brown’s impending free agency, many of the core pieces of this season’s championship roster will be back for next season.

And Booth wants another one. The organization he’s looked at and considers the model for sustained success? It’s the San Antonio Spurs.

Booth said there are a few ways Denver can implement what the Spurs created under legendary coach Gregg Popovich and generational forward Tim Duncan, perhaps Jokic’s best comparison as a foundational piece.

“In how they treat their players, in sustainability, long-term success and giving themselves many, many cracks at winning the championship,” Booth said.

Booth has long maintained that internal development and internal competition are two staples of a healthy functioning franchise.

“This is the highest level of competition that we just prevailed in,” Booth said. “It’s going to carry over into the regular season.”

The Nuggets got one. They’re already planning for more.

Want more Nuggets news? Sign up for the Nuggets Insider to get all our NBA analysis.

Under contract next season

Notes: The final year of both Gordon and Caldwell-Pope’s contracts are player options. The final year of Nnaji, Braun and Watson’s deals kick in if the Nuggets extend a qualifying offer. The final year of Cancar’s contract is a team option.

Potential free agents

Notes: Brown has a player option he can choose to exercise this summer to return next season. The Nuggets have the option to bring both Gillespie and White back next season under the above terms.

Unrestricted free agents

* All contract numbers according to HoopsHype.com.