Guidance Needed on Calculating Total Session Duration Per User

Hi guys, I'm stuck at this particular question. If I need to calculate total session duration PER user PER day, I know I have to use 'Aggregate Property per User' but I'm confused on which options to choose? first aggregation: sum, average, distribution, median, percentile, min, max second aggregation (on choosing sum): average, distinct count, min, max I know the 'Session Durations' property is to be used after this, just confused on exactly which aggs to choose? I went through the documentations but still don't understand