code: def calcontime(data, inds=None):
      
  
      if not inds:
          inds = range(len(data['time']))
          logger.info('No indices provided. Assuming all are valid.')
  
      scans = set([data['scan'][i] for i in inds])
      total = 0.
      for scan in scans:
          time = [data['time'][i] for i in inds if data['scan'][i] == scan]
          total += max(time) - min(time)
  
      return total
docs: Given indices of good times, calculate total time per scan with indices.