MacTCP on my Macintosh Plus has non-configurable DNS-lookup and TCP-open timeouts of 45 seconds.
I like imagining that UDP or SYN packet reaching the router on its 10BASE2 ethernet and then getting queued while the router initializes its modem, dials a phone number, waits while it rings, waits for its PPP login credentials to be verified by the RADIUS server, and then finally sends its queued packet out to the internet, where it gets a reply that is routed back to the Mac after 35 seconds.