What are the limits of the robots in distance in a typical set-up?

Error message

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Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /home4/belassal/public_html/cabotics/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /home4/belassal/public_html/cabotics/includes/common.inc).
Deprecated function: implode(): Passing glue string after array is deprecated. Swap the parameters in drupal_get_feeds() (line 394 of /home4/belassal/public_html/cabotics/includes/common.inc).

600'+ each way equating to 1200'+ in one set up running both directions from a manhole.