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Ha! If only.
From the sounds of it then, my current 30min cycling and 5mins rowing each day is probably fine, with the aim of increasing the resistance/elevation slightly on the cycling every few days.
I really do need to get on the stretching though. Especially now I'm back at a computer instead of climbing in a soft play. Handily pure gym gives you little videos you can watch on your phone for a few "classes", including stretching.
Go at it like that and you might break yourself before the big day.
Most training programs suggest you increase either intensity or duration by 10% a week.
Do a mixture of cardio, core strength work and flexibility. But trying like you are in a Hollywood montage is probably counter productive.
https://youtu.be/pFrMLRQIT_k?si=MCuuQPlbLdW28Rns