The default for tile age seems to be 30s. This seems way too short. While someone actively mapping in OSM might want to reload, it seems like map tiles are relatively static over that kind of timescale. I have set the tile age to 604800s (1 week). It seems rude to OSM to recheck tiles more often than once a day, or maybe once an hour.
For terraserver DRG and imagery, 1 week is perhaps too short - those bits are quite static. What's the motivation for 30s? Would anyone object to changing it to 1 week?
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