It'll be three years or five, if not more. The actual difference between Wemby and a guy like Giannis or Jokic is massive right now, even if the stats don't show it. Wemby's window hasn't opened yet, and his supporting cast is not the reason why. That's an internal thing based on his skill, temperament and experience. That process cannot be skipped or even meaningfully accelerated. Pop knows this. Manu knows this. Even Charles Barkley knows this.
The Spurs should absolutely not approach this off-season with a mandate to build a winning team. That's how you become one of those teams that throws a ton of assets and flexibility down the drain. The mandate should be to put the pieces around Wemby for him to continue his development. That should mean the Spurs get better players, and the hope is that it results in a fair bit more wins. But barring something drastic, the team is on Wemby's timeline, and that timeline may not be as far along as Victor himself wants it to be.
That's why Trae Young seems like a particularly bad trade target. He's neither young enough to grow slowly with Victor nor experienced enough to guide him. He's a relatively immature star making a ton of money and who has enough accolades where he seems to not want to adapt his way of playing at all. If their ages were reversed, and Victor were the youngish superstar in his early prime and Young were the rookie fire cracker with unreal production, the match would be amazing. It would be Duncan/Parker 2.0. If you imagine the Spurs had they drafted Tony in 1997 and Duncan (somehow) in 2001, you can get a sense of why that's unideal.
Issue is, the league is really hurting from the 2012-2015 drafts being mostly awful. There's a lack of 30ish stars and the couple who are there like Davis, Embiid and Giannis aren't moveable and wouldn't be good fits anyway. You end up with mid-30s guys having to fill those roles, but a lot of those players have already fallen apart like Kemba, Cousins and Wall. We're at the point where the best pipedream is Paul George deciding he wants to play with Wemby and Devin for a couple of years and is willing to take less to do so. I'm starting to wonder if the Spurs are going to end up being the team that gives Harden a bag. It's basically the same thing as Young but without the long-term commitment and with the downside of having Harden in a Spurs uniform.