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The United legend won a record 13 Premier League titles under Sir Alex Ferguson - the most recent coming in the Scot's final year as a manager in the 2012/13 campaign.
United have not mounted a serious title challenge since, with Chelsea, Leicester City, Manchester City and Liverpool all achieving league title successes in the seven years since United were last crowned champions.
Giggs was quick to point out that Liverpool went 30 years without winning the league and their title triumph last term came four years into Jurgen Klopp's reign at Anfield.
"Yes, 100 per cent," Giggs told Jamie Carragher on the Greatest Game Podcast when asked if he was worried about how long it would take United to win a league title again.
Episode 3 of series 2 @GreatestGamePod with #ManUtd & @premierleague Legend Ryan Giggs! :headphones::microphone2:- Jamie Carragher (@Carra23) October 29, 2020
• Playing under SAF :soccer:
• CL success & failures :trophy:
• Managing Wales :flag_black:
• Being punched by LVG :punch:
• THAT GOAL :dash:https://t.co/waKG6IQ0Vb pic.twitter.com/kX7Uvkim2N
"It could be 15, 20 years before you know it, especially if [Jurgen] Klopp and [Pep] Guardiola stick around.
"They have got the resources and the players so we have Liverpool to look at, where the last time when they won it in 1990. They thought 'we'll win it again soon.'
"Even Klopp, it took four-and-a-half years for him to win it - it takes a long time.
"You have to think about what Klopp did.
"He improved the team every season or won a trophy like the Champions League and then you saw the improvement so the pressure was off a little bit.
"Every manager and signing [for United] is seen as that 'he will win us the league' and it's not like that."
Having taking charge of United on an interim basis and carried out the role as Louis van Gaal's assistant, Giggs has been manager of the Wales national team since 2018.
He has ambitions to go into club management but thinks the dream job at United has gone.
"I'm happy with the job I've got," Giggs stated.
"I can't see that (Man United) coming around again. I must say I'm enjoying the Wales job at the moment. There's lots of pluses, and there's lots of frustrations. I think eventually I will want to go into club management, but when that is, I don't know."
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