How to I ask "How Long"/Duration Questions--not date based but numeric based

So most of my questions are along the lines of "how long did you spend..." or "how long did it take..."
I'm not really interested in dates. I want answers in formats like "4 months" or "1 year, 3 months, 2 days".
Right now I'm using the old Qualtrics editor so I can use the "form" Text Entry type question and I have four boxes labeled "years", "months", "weeks", "days".
But I would rather drop-down boxes much like the Calendar-Date questions I can import from the Questions Library in the Demographics folder. I have one question where I ask participants to enter a "start" and "end date" but that's not really ideal. And the text box entry also leaves more room for data input error. The date drop downs work but I don't want people to level the survey if they don't know exactly what date. I would just rather they could say "5 months".
Would there be any way to edit the current options in the Demographics library or create a sort of scroll or drop down with just numbers beside or under the words "years", "months", "days".
Thanks in advance