That title probably doesn't make sense so I'll try to explain.
I don't get my bike out to go the the corner shop because by the time I've got the bike out of the shed, round the house and cycled there and locked up my bike I could already have walked there (5mins max) and be half way round the shop.
So what's your limit of walk vs bike? If it's a 10 minute walk, would you take the bike or prefer to walk? 15 minute walk?