Adding a time or monetary unit to a question

Dear all,

I want to ask a question in my survey saying after experiencing health problems how long did it take you to realise you needed medical care.

I need the patient to respond with a number and then choose the appropriate unit- weeks, days, hours or minutes.

I can't figure out how to have a space for them to fill in an integer number and then choose a unit like you would on a paper tool.

Please do you have any suggestions.

Thank you very much!