it actually fits to make a NNNd NNh display so this can be used up to

999 days

lib/progress.c

@@ -56,8 +56,8 @@ static void time2str(char *r, long t)
   else {
     /* this equals to more than 99 hours, switch to a more suitable output
        format to fit within the limits. */
-    if(h/24 <= 99)
-      sprintf(r, " %2dd %02dh", h/24, h-(h/24)*24);
+    if(h/24 <= 999)
+      sprintf(r, "%3dd %02dh", h/24, h-(h/24)*24);
     else
       sprintf(r, "%7dd", h/24);
   }