I don't know about labor costs in your area, but I recently did this and it took me ~2-3 hours, but I'm a DIY'er and took probably longer than a shop (also did start of delivery and valve-lash adjustments in that time period since the Valve cover was off). If you plan on doing this yourself, you might want to first find a MB dealer or a motorcycle shop that rents a double chain master-link crimping too; so you don't get stuck later.

ATLD