I am planning a short visit to Europe ( 23 -30 december),however my visa expires on 29 december.

Anybody knows how many weeks before expiring date I can make my request for extension?

(I tried all search methods,but could not find.)

Thanks.

One month I believe

Should not be any problem - just go a few days before you depart and remember to get a re entry permit after you get the extension (be it a month or full year).

Thanks,

But I don't want togo a few days before .I want to go as long time as possible before.I need security because I will book flight with No change of date possibility.

If something not OK,I have time to correct.

I am not the last minute type.

Any specific term,like max 3 or 4 weeks b4 expiring.There must be a rule somewhere

Should not be any problem - just go a few days before you depart and remember to get a re entry permit after you get the extension (be it a month or full year).

<{POST_SNAPBACK}>

I suggest you tell the immigration officer what you are doing.

He may be able to help you on the date he stamps for your next visit to get the

extension. Or advise when the extension will be available.

I have found them to be most helpful in these matters.

The Re-entry permit is most important.

Any specific term,like max 3 or 4 weeks b4 expiring.There must be a rule somewhere

30 days

Thanks,

I will go to Suan Plu on Dec.5 or 6 and will let you know my findings

I wonder if this is a VISA EXTENSION really, isnt it rather just another 1-year-multiple-entry-B or -O VISA stamped in your passport after they old one expired....

No. OP said "extension" and that is what you get from immigration. They do not issue multi entry B or O visas.