at a time, at all times One of my colleagues sneezes at all times (really haha). (or at all time?) Please ask me a question at a time. Are both of them correct? Is 'at all times' interchangeable with all the time and always? If any one of you can give me some examples with an explanation, I would be very glad! Thanks a lot for your help in advance. Have a nice day! Hyunwook