La Crosse Technology WIRELESS WEATHER STATION Instruction Manual page 12

typically between 3-5 minutes in good conditions.
Note:
•
If after 10 minutes, the DCF time has not been received, press the SET
key to manually enter a time initially.
•
Daily DCF reception is done at 02:00 and 03:00. If the reception at 03:00 is
not successful, then at 04:00 and 05:00 and 06:00 there are other tries,
until one is successful. If the reception at 06:00 is still not successful, then
the next try takes place at 02:00 next day.
•
When this is successful, the received time will override the manually set
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