Answer

Palak Viman ke size ke baare mein alag-alag granthon aur paramparaon mein vivaran milta hai, lekin mujhe is samay iski exact lambai/maap “kitne yojan” ka hai, is par poori tarah se verified Jain parampara ka nishchit uttar dena sambhav nahi hai.

Sorry, I can only provide information that is clearly established within Jain tradition.