Needing some advice here... I have received an offer a little less than a month ago, and while talking with the POI I told him I would be able to decide if accepting the offer or not around mid-March, as I anticipated my last interview (last week of February) will have results by then. However, the last school I interviewed at turned out to have limited spots within the department and therefore the POI I applied to didn't even know if he could take a student this year, so the wait time can't be predicted. So should I tell the POI of the first school that I would need a little bit more time to wait on this second decision, or would that be inappropriate? Thanks!