I have no idea how many German tracked vehicles made to the end of the 1941 marches and how many of the ones than were there at end started somewhere in the middle as replacements and/or how many got major maintenance in the Field. I would be very much surprised if any of the ones still mobile in Nov/Dec of 1941 were the ones that started in June. At least not without major work.
However the same can be said for most other tanks. Matildas in parts of Africa were going through steering clutches in 600 miles. Most tanks could not make 1000 miles on a set tracks.
Valentines staggered into Tunisia with 1500 miles on some of them which amazed some people in the tank community. Some of them were running with missing bogie wheels and many of them had several (or more than several) links taken out of the tracks to try to keep them tight.
Early T-34s, despite the amazing performance of the prototype, were going through transmissions like a bowl of hot soup on Russian winter's day.
Less said about the KVs the better, poster child for performance in field not matching the proving ground, In part due to poor training of the drivers, poor design, poor implementation.
In the 1950s American M-48s were breaking down something like once every 40 miles or so?
Now there are minor breakdowns and there are major breakdowns and there are peacetime breakdowns (stop before something else breaks) and wartime breakdowns (keep going until it won't move anymore).