Gen 4 Expensive

I have no idea of its accuracy, but Toyota’s own Flat Rate Manual (available by subscription to toyota-tech.eu) allows 10.1 hours to remove and reinstall the partial engine assembly: 9.6 hours for the basic operation (120051) plus 0.3 hours for E.G.R. and 0.2 hours for air conditioning.

That’s just to swap the assemblies, of course; for an engine overhaul (operation 120012) they allow 32.5 hours, and to remove and reinstall the cylinder block subassembly (operation 111011) they allow 19.6 hours.

You’ve found Toyota’s list price for the partial engine assembly (19000-37780); it’s being offered online for much less, though some sources say it’s not available. This might be because dealers need special permission to install one as a warranty repair. After noting the availability of engine parts and short block assemblies, the Toyota Warranty Policy and Procedures Manual says:

“In those very unusual situations where Product Quality and Service Support (PQSS) determines that a long block engine assembly is needed, dealers are required to obtain pre-authorization from PQSS and obtain a JTR [Japan Technical Request] number prior to repair and before ordering parts.”​

To give you an idea of the markup, the similar part for a Prius in Japan (19000-37790) has a list price of ¥391,000. (The price on Amazon.co.jp is somewhat higher, and I think their free shipping is limited to Japan.)