curl-w32/docs/cmdline-opts/speed-time.md

c	SPDX-License-Identifier	Long	Short	Arg	Help	Category	Added	Multi	See-also	Example
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.	curl	speed-time	y	<seconds>	Trigger 'speed-limit' abort after this time	connection	4.7	single	speed-limit limit-rate	--speed-limit 300 --speed-time 10 $URL

--speed-time

If a transfer runs slower than speed-limit bytes per second during a speed-time period, the transfer is aborted. If speed-time is used, the default speed-limit is 1 unless set with --speed-limit.

This option controls transfers (in both directions) but does not affect slow connects etc. If this is a concern for you, try the --connect-timeout option.