diff --git a/src/main.rs b/src/main.rs
index 431d12b..94d15b6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -63,7 +63,7 @@ enum ProofResult
 }
 
 fn run_vampire<I, S>(input: &str, arguments: Option<I>)
-	-> Result<ProofResult, ask_dracula::Error>
+	-> Result<(ProofResult, Option<f32>), ask_dracula::Error>
 	where I: IntoIterator<Item = S>, S: AsRef<std::ffi::OsStr>
 {
 	let mut vampire = std::process::Command::new("vampire");
@@ -106,18 +106,24 @@ fn run_vampire<I, S>(input: &str, arguments: Option<I>)
 
 		if proof_not_found_regex.is_match(stdout)
 		{
-			return Ok(ProofResult::ProofNotFound);
+			return Ok((ProofResult::ProofNotFound, None));
 		}
 
 		return Err(ask_dracula::Error::new_run_vampire(
 			format!("Vampire returned unsuccessful exit code ({})\n\n======== stdout ========\n{}\n\n======== stderr ========\n{}", output.status, std::str::from_utf8(&output.stdout).unwrap_or("(not valid UTF-8)").trim(), std::str::from_utf8(&output.stderr).unwrap_or("(not valid UTF-8)").trim())));
 	}
 
+	let proof_time_regex = regex::Regex::new(r"% \(\d+\)Success in time (\d+(?:\.\d+)?) s").unwrap();
+
+	let proof_time = proof_time_regex.captures(stdout)
+		.map(|captures| captures.get(1).unwrap().as_str().parse::<f32>().ok())
+		.unwrap_or(None);
+
 	let refutation_regex = regex::Regex::new(r"% \(\d+\)Termination reason: Refutation").unwrap();
 
 	if refutation_regex.is_match(stdout)
 	{
-		return Ok(ProofResult::Refutation);
+		return Ok((ProofResult::Refutation, proof_time));
 	}
 
 	Err(ask_dracula::Error::new_interpret_vampire_output(stdout.to_string(), stderr.to_string()))
@@ -155,7 +161,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>>
 		{
 			let conjecture = find_conjecture(&project, proof_direction);
 
-			let vampire_result = match conjecture
+			let (vampire_result, proof_time) = match conjecture
 			{
 				None =>
 				{
@@ -183,7 +189,14 @@ fn main() -> Result<(), Box<dyn std::error::Error>>
 				},
 				ProofResult::Refutation =>
 				{
-					println!("assertion proven");
+					if let Some(proof_time) = proof_time
+					{
+						println!("assertion proven in {} seconds", proof_time);
+					}
+					else
+					{
+						println!("assertion proven");
+					}
 
 					conjecture.kind = ask_dracula::project::StatementKind::Axiom;
 					conjecture.original_text = replace_statement_kind_regex.replace(&conjecture.original_text, "axiom").to_string();