I applied for a software dev position two days ago, sent in a couple of requested micro solutions yesterday, and today scheduled an "informational and technical" interview over the phone for next week.
Would it be inappropriate to send another email and ask how long the call should take? Would that send negative impressions, i.e. I don't value their time?
If possible, I'd like to use that time estimate to gauge what I might expect from the interview and how I should study. (That is, will the technical questions be only on theory or will it involve coding?) I did already ask if I would need any special materials for the technical portion, and they said no.