Yes when I began I may have foolishly toyed with the idea of target times and what may be achievable. However the reality of injuries and my starting point soon fucked that off!
My target is to finish, and to run continuously with no walking etc. If I look at my comfortable pace that avoids the issues I’ve had in training then 2 hours 30 mins is more like a reasonable thing to go for. This may not seem awfully fast or ambitious but I keep having to say I’m a fast twitch short legged non runner so believe me finishing this will be a major achievement.
When half marathon runners can squat their bodyweight and do 30 pull ups then I’ll change my tune