Thor and Jane broke up on 2015 May 17. So if i add 8 years, 7 months and 6 days, (give or take) it'll be 2023 December 23. Thor joined the Guardians on 2023 October 30. So Thor went from fat to fit in just 54 days???!!.
He is a god so because of it he could be just easily regain his godly physique in weeks. God's physiology must be very different from other beings.
But i strongly believe that it was just a bluff. Thor might said those random numbers faster so he could impress Jane.
There's a possibility for that scene not to be included in the movie. Who knows
What's your views on this