Is there any confirmation or source that such a restriction on e-visas exists? I would like to enter Vietnam on a Saturday leave the next day and then return the following Saturday for 5 days using two e-visas (US citizen). I have gotten a few e-visas before which have taken the standard 2-3 days so I thought I should be fine getting the second e-visa on time. In the (unlikely) event that the seconde-visa takes longer than expected could I get a VOA for the second trip quickly as a backup?