Thank you for the information. But it seems 2 or 3 days is (rightly after all) considered a too short stay in both centers.
Anyway, interesting to note differences in the way foreign registrations are described:
Mahasi Meditation Center wrote:Yogis from abroad ... should contact the organization in writing ... their knowledge of the Buddha-dhamma ... the name and address of the center... Mediation Teacher ...
On receipt of such information the Organization will issue to acceptable person a "Sponsorship letter" to be attached to his or her application to the Myanmar Embassy or Consulate nearest to one''residence.
Then only, issue of a "Special Entry Visa" for meditation for a period of six to twelve weeks will be considered by the authorities. Candidates are advised not to come with a Tourist Visa of seven days as it cannot be extended on any grounds. Processing of a Special entry Visa usually takes three to four weeks as it involves 2 or 3 government departments.
Chanmyay Yeiktha Meditation Centre wrote:If you arrive with a tourist visa and wish to practise extensively, we can arrange "meditation visa" extensions for up to one year.