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YouTube is pretty good to give you an idea of stuff. Try to do an hour as the warm up bits and relaxation at the end are all part of the process of getting your joints and muscles to move.
Be careful if you are hypermobile. Just be aware if you are to protect your joints and don’t over stretch them. Look it up and test each joint.
Also, this guy is great: https://www.instagram.com/p/B0ZcKhTAd5R/?igshid=16x28eieic9dg
Dr.Jacob.Harden if the link doesn’t work. It might be more realistic for some to do his mobilisations and strengthening rather then a whole yoga/Pilates session.
Weekly yoga or pilates helps with comfort on the bike. Having a stronger core and some flexibility in your hips is what you are aiming for. Once you can ride 200km the rest is just sitting on the bike.