How far to heaven?

The king said: ‘How far is it, Nāgasena, from here to the Brahma world ?’
‘Very far is it, O king. If a rock, the size of an upper chamber, were to fall from there, it would take four months to reach the earth, though it came down eight-and-forty thousand leagues each day and night.’
‘Good, Nāgasena! Now do not your people say that a Bhikkhu, who has the power of Iddhi and the mastery over his mind, can vanish from jambu-dīpa, and appear in the Brahma world, as quickly as a strong man could stretch forth his bent up arm, or bend it in again if it were stretched out? That is a saying I cannot believe. How is it possible that he could traverse so quickly so many hundreds of leagues?’
The Elder replied: ‘In what district, O king, were you born?’
‘There is an island called Alasanda. It was there I was born.’
‘And how far is Alasanda from here?’
‘About two hundred leagues.’
‘Do you know for certain of any business you once did there and now recollect?’
‘Oh, yes.’
‘So quickly, great king, have you gone about two hundred leagues.’
‘Very good, Nāgasena!’