diff --git a/.travis.yml b/.travis.yml
index 208339b..607f4c0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,6 +17,7 @@ jobs:
 script:
 - cargo build
 - cargo test
+- "ulimit -n 5000; cargo test timelimits:: -- --ignored --test-threads=1 --show-output"
 - cargo fmt -- --check
 after_failure:
 - wget https://raw.githubusercontent.com/DiscordHooks/travis-ci-discord-webhook/master/send.sh
diff --git a/Cargo.lock b/Cargo.lock
index 0ae154b..114525b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1138,6 +1138,7 @@ dependencies = [
  "structopt",
  "toml",
  "trust-dns-resolver",
+ "wait-timeout",
 ]
 
 [[package]]
@@ -1463,6 +1464,15 @@ version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
 
+[[package]]
+name = "wait-timeout"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9f200f5b12eb75f8c1ed65abd4b2db8a6e1b138a20de009dacee265a2498f3f6"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "waker-fn"
 version = "1.1.0"
diff --git a/Cargo.toml b/Cargo.toml
index 860d147..20c7501 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -37,6 +37,9 @@ cidr-utils = "0.5.0"
 itertools = "0.9.0"
 trust-dns-resolver = { version = "0.19.5", features = ["dns-over-rustls"] }
 
+[dev-dependencies]
+wait-timeout = "0.2"
+
 [package.metadata.deb]
 depends = "$auto, nmap"
 section = "rust"
diff --git a/tests/timelimits.rs b/tests/timelimits.rs
new file mode 100644
index 0000000..9851a3e
--- /dev/null
+++ b/tests/timelimits.rs
@@ -0,0 +1,108 @@
+/*
+ * Test rustscan against different targets with a time limit.
+ * The tests assumes target/debug/rustscan has already been built.
+ *
+ * The tests are #[ignore] to avoid running them during normal development.
+ *
+ * Their tests in the timelimits module are run by travis during CI.
+ */
+
+use std::process::Command;
+use std::time::Duration;
+use wait_timeout::ChildExt;
+
+const TIMEOUT_MARGIN: u32 = 3;
+
+fn run_rustscan_with_timeout(args: &[&str], timeout: Duration) {
+    println!("Running: target/debug/rustscan: {}", args.join(" "));
+
+    use std::time::Instant;
+
+    let start = Instant::now();
+
+    let mut child = Command::new("target/debug/rustscan")
+        .args(args)
+        .spawn()
+        .unwrap();
+
+    let mut tries = TIMEOUT_MARGIN;
+    loop {
+        match child.wait_timeout(timeout).unwrap() {
+            Some(_status) => break,
+            None => {
+                tries -= 1;
+                if tries == 0 {
+                    // child hasn't exited yet
+                    child.kill().unwrap();
+                    child.wait().unwrap().code();
+                    panic!("Timeout while running command");
+                }
+            }
+        }
+    }
+    let end = Instant::now();
+    let duration = end.saturating_duration_since(start).as_secs_f32();
+
+    println!("time: {:1.1}s", duration);
+}
+
+mod timelimits {
+
+    #[test]
+    #[ignore]
+    fn scan_localhost() {
+        let timeout = super::Duration::from_secs(25);
+        super::run_rustscan_with_timeout(&["--greppable", "--no-nmap", "127.0.0.1"], timeout);
+    }
+
+    #[test]
+    #[ignore]
+    fn scan_google_com() {
+        super::run_rustscan_with_timeout(
+            &[
+                "--greppable",
+                "--no-nmap",
+                "-u",
+                "5000",
+                "-b",
+                "2500",
+                "google.com",
+            ],
+            super::Duration::from_secs(28),
+        );
+    }
+
+    #[test]
+    #[ignore]
+    fn scan_example_com() {
+        super::run_rustscan_with_timeout(
+            &[
+                "--greppable",
+                "--no-nmap",
+                "-u",
+                "5000",
+                "-b",
+                "2500",
+                "example.com",
+            ],
+            super::Duration::from_secs(28),
+        );
+    }
+
+    #[test]
+    #[ignore]
+    fn scan_rustscan_cmnatic_co_uk() {
+        super::run_rustscan_with_timeout(
+            &[
+                "--greppable",
+                "--no-nmap",
+                "-u",
+                "5000",
+                "-b",
+                "2500",
+                "rustscan.cmnatic.co.uk",
+            ],
+            super::Duration::from_secs(26),
+        );
+    }
+}