diff --git a/rainfallwrangler/src/lib/async/debounce.mjs b/rainfallwrangler/src/lib/misc/debounce.mjs
similarity index 70%
rename from rainfallwrangler/src/lib/async/debounce.mjs
rename to rainfallwrangler/src/lib/misc/debounce.mjs
index a21f08c..0ef383f 100644
--- a/rainfallwrangler/src/lib/async/debounce.mjs
+++ b/rainfallwrangler/src/lib/misc/debounce.mjs
@@ -11,10 +11,16 @@
  * @return	{function}	A debounced wrapper function around the specified function.
  */
 export default function(fn, interval) {
-	const time_last = 0;
+	if(typeof interval !== "number")
+		throw new Error(`Error: Expected interval to be of type number, but got value of type ${typeof interval}`);
+	
+	let time_last = 0;
 	return (...args) => {
 		const now = new Date();
-		if(now - time_last > interval)
+		// console.log(`DEBUG:debounce time since last`, now - time_last, `interval`, interval)
+		if(now - time_last > interval) {
+			time_last = now;
 			fn(...args);
+		}
 	}
-}
\ No newline at end of file
+}
diff --git a/rainfallwrangler/src/lib/record/jsonl_to_tf.mjs b/rainfallwrangler/src/lib/record/jsonl_to_tf.mjs
index 824b9db..c34f740 100644
--- a/rainfallwrangler/src/lib/record/jsonl_to_tf.mjs
+++ b/rainfallwrangler/src/lib/record/jsonl_to_tf.mjs
@@ -6,7 +6,7 @@ import os from 'os';
 import p_map from 'p-map';
 import pretty_ms from 'pretty-ms';
 
-import debounce from '../async/debounce.mjs';
+import debounce from '../misc/debounce.mjs';
 import py_jsonl2tfrecord from '../python/py_jsonl2tfrecord.mjs';
 import log from '../../lib/io/NamespacedLog.mjs'; const l = log("jsonl2tf");
 
@@ -20,12 +20,12 @@ import log from '../../lib/io/NamespacedLog.mjs'; const l = log("jsonl2tf");
 export default async function(dirpath_source, dirpath_target) {
 	const files = await fs.promises.readdir(dirpath_source);
 	
-	let time_start = new Date(), lines_processed = 0, files_complete = 0;
+	let time_start = new Date(), lines_processed = 0, files_processed = 0;
 	
 	const update_progress_force = () => {
-		process.stdout.write(`${files_complete}/${lines_processed} files/lines complete | ${((new Date() - time_start) / lines_processed).toFixed(3)} lines/sec | ${((files_processed / files.length)*100).toFixed(2)}% complete\r`);
+		process.stdout.write(`${files_processed}/${lines_processed} files/lines complete | ${((new Date() - time_start) / lines_processed).toFixed(3)} lines/sec | ${((files_processed / files.length)*100).toFixed(2)}% complete\r`);
 	};
-	const update_progress = debounce(update_progress_force);
+	const update_progress = debounce(update_progress_force, 2000);
 	
 	await p_map(files, async (filename, i) => {
 		const filepath_source = path.join(dirpath_source, filename);
@@ -35,15 +35,15 @@ export default async function(dirpath_source, dirpath_target) {
 		let time_start = new Date(), lines_done = 0;
 		for await (let line_number of py_jsonl2tfrecord(filepath_source, filepath_dest, filepath_meta)) {
 			lines_processed++;
-			lines_done = line_number;
+			lines_done++;
 			update_progress();
 		}
-		files_complete++;
+		files_processed++;
 		l.info(`DEBUG lines_done`, lines_done);
 		
 		const time_per_line = (new Date() - time_start) / (lines_done === 0 ? 1 : lines_done);
 		l.log(`converted ${filename}: ${lines_done} lines @ ${pretty_ms(time_per_line)}/line`);
 	}, { concurrency: os.cpus().length });
 	update_progress_force();
-	l.log(`complete: ${lines_processed}/${files_complete} lines/files processed in ${pretty_ms(new Date() - time_start)}`);
+	l.log(`complete: ${lines_processed}/${files_processed} lines/files processed in ${pretty_ms(new Date() - time_start)}`);
 }