From https://www.sciencedaily.com/releases/2020/03/200317175438.h... :
A new study calculates that the median incubation period for COVID-19 is just over 5 days and that 97.5% of people who develop symptoms will do so within 11.5 days of infection.
From https://de.wikipedia.org/wiki/COVID-19#Inkubationszeit :
...the incubation period can be up to 14 days. In addition, there are reports from Chinese researchers that extend the possible incubation period up to 24 days. An analysis of the first 425 cases reported in Wuhan shows an incubation period of 5.2 days on average and an average age of 59 years. ... A statistical analysis of several reports of infections in a household or in another narrow spatial limitation (so-called clusters) shows an incubation period of 5–6 days on average.
Anyway, as long as people don't keep distance between each other, the situation won't improve. Here in Switzerland the limit was shurunk within ~2 weeks from groups of people of max 1000 to 500 to 100 to 10 to 5 (today's new guidelines) => so far nothing improved.
The company I'm working for reacted early => many employees started staying at home (and working remotely) already 3 weeks ago, like myself => at the beginning it was ok for me, but now it's getting psychologically a bit "heavy". Luckily the government so far did not implement a total curfew, so from time to time we can still walk a bit in the parks/forests (but alone).