diff --git a/slurm-eff-tool.py b/slurm-eff-tool.py
index 2f50641..36cee4b 100755
--- a/slurm-eff-tool.py
+++ b/slurm-eff-tool.py
@@ -49,7 +49,7 @@ import sys
 import signal
 import tempfile
 import time
-from datetime import datetime
+from datetime import datetime, timedelta
 from zoneinfo import ZoneInfo
 from collections import defaultdict
 from dataclasses import dataclass, field, fields, asdict
@@ -237,6 +237,7 @@ ALIASES = {
 }
 
 NUMERIC_COLUMNS = {
+    "Nr.",
     "CPUs",
     "NTasks",
     "Nodes",
@@ -251,6 +252,7 @@ NUMERIC_COLUMNS = {
     "MaxRSS_max",
     "Mem_Eff",
     "Time_Eff",
+    "Walltime",
     "Walltime_max",
     "waste_CPU",
     "waste_Mem",
@@ -633,6 +635,17 @@ def format_seconds(seconds: int | float | None) -> str:
         return f"{days}-{hours:02d}:{minutes:02d}:{sec:02d}"
     return f"{hours:02d}:{minutes:02d}:{sec:02d}"
 
+def format_hours(hours: float | None) -> str:
+    """Return string representation in format hours:seconds"""
+    if hours is None:
+        return "Unknown"
+    td = timedelta(hours)
+    sraw = int(td.total_seconds())
+    hr = sraw // 3600
+    mn = (sraw % 3600) // 60
+    sc = sraw % 60
+    return f"{hr}:{round(mn,0)}:{sc}"
+
 
 def parse_size_to_bytes(value: str) -> int | None:
     """Parse Slurm memory size fields such as 1024K, 2000M, 8Gn, 4Gc, 1.5T."""
@@ -1348,7 +1361,7 @@ def format_value(value: Any, column: str | None = None) -> str:
         return f"{value:.2f}G"
     if column in ["ReqWalltime", "Walltime", "Walltime_max",
                   "Elig_Qtime", "Planned_Time"]:
-        return f"{value:.2f}h"
+        return format_hours(value)
     if column in ["Start"]:
         return datetime.fromtimestamp(value).strftime("%Y-%m-%dT%H:%M:%S")
 
@@ -1376,7 +1389,11 @@ def print_table(rows: list[OutputRow], columns: list[str], sdev: bool) -> None:
     print("  ".join(col.ljust(widths[col]) for col in columns))
     print("  ".join("-" * widths[col] for col in columns))
     for d in dicts:
-        print("  ".join(format_value(d.get(col), col).ljust(widths[col]) for col in columns))
+        print("  ".join(
+            format_value(d.get(col), col).rjust(widths[col])
+            if col in NUMERIC_COLUMNS
+            else format_value(d.get(col), col).ljust(widths[col])
+            for col in columns))
 
 
 def columns_from_fmtstr(fmt: str) -> list[str]: