@eal The first estimations of the results are extrapolated from the results of polling stations, and some polls done by polling institutes in the days before and during the election day. However, unlike previous elections, the polling stations now close at 19:00 and not 18:00 in most municipalities (they close at 20:00 in the main cities). So the polling institutes are not sure they can give good enough estimations at 20:00, since they have less time to consolidate the results.