That's the latency it takes to get back the IP of the domain name you're looking up.
I typically get somewhere between 55 to 65 ms on Quad9 (on their malware filtering servers) over DOH but that's 'double NAT'd' — from behind another router before hitting the WAN — ~30 to 45/DOH on the edge, sorting algo/remote load dependent:
Wed Aug 6 09:29:08 2025 daemon.err dnscrypt-proxy[2299]: [2025-08-06 09:29:08] [NOTICE] - 35ms quad9-doh-ip4-port443-filter-alt
Wed Aug 6 09:29:08 2025 daemon.err dnscrypt-proxy[2299]: [2025-08-06 09:29:08] [NOTICE] - 36ms quad9-doh-ip4-port443-filter-alt2
Wed Aug 6 09:29:08 2025 daemon.err dnscrypt-proxy[2299]: [2025-08-06 09:29:08] [NOTICE] - 38ms quad9-doh-ip4-port443-filter-pri
Wed Aug 6 09:29:08 2025 daemon.err dnscrypt-proxy[2299]: [2025-08-06 09:29:08] [NOTICE] Server with the lowest initial latency: quad9-doh-ip4-port443-filter-alt (rtt: 35ms)
I can 'feel' ~90 to 100+ ms but your tolerance may be higher than mine. IIRC the best I've personally seen was < 30 ms (~25 ms?) using Cloudflare/DOH but I don't like Cloudflare. They hold logs for 24--48 hrs. No thanks.