What's the longest possible worldwide phone number I should consider in SQL varchar(length) for phone

What's the longest possible worldwide phone number I should consider in SQL varchar(length) for phone.

considerations:

• + for country code
• () for area code
• x + 6 numbers for Extension extension (so make it 8 {space})
• spaces between groups (i.e. in American phones +x xxx xxx xxxx = 3 spaces)
• here is where I need your help, I want it to be worldwide

Consider that in my particular case now, I don't need cards etc. number begins with country code and ends with the extension, no Fax/Phone etc. comments, nor calling card stuff needed.

Well considering there's no overhead difference between a varchar(30) and a varchar(100) if you're only storing 20 characters in each, err on the side of caution and just make it 50.