I’d say there’s no municipal police force in the country that has a sufficiently technically sophisticated regular law enforcement to try to attack a running machine. So if you are suspected of having information relevant to a murder or drug deal—the seize and examine one month later scenario is extremely likely.
A handful of states and maybe one or two municipalities may have a computer crimes division that would be sophisticated enough to know to worry about encrypted disks, but they’d have to hire expensive outside consultants to carry out the actual attack and would do so in exceptional circumstances rather than routinely.
Finally, if your threat model includes the national security apparatus then, yes, this is probably too much of a compromise.