To my knowledge, you can not get a US visa in UK. You have to apply it either in China or in Mexicao/Canada borders cities.
As for the security check, nobody can gaurantee. But currently, it only takes about 4 weeks.
• 多谢!提前多长时间去合适, 就是说拿到签证后有效时间是几个月? -sun105- ♂ (156 bytes) () 10/31/2006 postreply 17:41:54
• 他的意思是你不能在英国申请回美国的签证,回中国等security check -poiuy- ♂ (23 bytes) () 10/31/2006 postreply 18:56:37
• 或是在加拿大或墨西哥先签好回美visa,否则在美国签英国visa都有困难 -xiaobaitu- ♀ (0 bytes) () 10/31/2006 postreply 20:40:15
• Make sense. do you know how long the security check will take no -sun105- ♂ (17 bytes) () 11/01/2006 postreply 08:59:33