Iโll be in Thailand for up to 30 days (by air) then move onto Vietnam/Cambodia. Iโll then be back in Thailand (by land) and will likely need up to 60 days for this entry. Can I apply for the 60 day tourist visa before arrival and only use it for my second entry, or will this visa be applied to my first entry only (Iโm not sure if the visa requires a date of arrival). UK passport.