People who like coverage might consider an update, it’s now easier than ever to draw the tracks for the last 8 hours:
Update tar1090, wait for the history to populate.
/tar1090/?pTracks will show you tracks for the last 8 hours (maximum unless otherwise configured)
/tar1090/?pTracks=2.5 will show you tracks for the last 2 and a half hours.
Changing / adding PTRACKS=24 to the /etc/default/tar1090 configuration will extend the maximum time of history available via /tar1090/?pTracks (after a restart of tar1090 or reboot)