> But wasting a month tryig to write native Sql queries can hurt your project a lot more.
Unless it would be the first contact a developer has with SQL, I really don't see how difference in time taken to query the database with an ORM vs SQL would be anything more than a couple of minutes, maybe an hour if you really have a hard time with it or your data model is really convoluted.
This really depends entirely on what your application is doing and how it generates and processes queries. Some things are just annoying to solve without an ORM / "query builder" / SQL-AST (unless you write a small ORM yourself).
Unless it would be the first contact a developer has with SQL, I really don't see how difference in time taken to query the database with an ORM vs SQL would be anything more than a couple of minutes, maybe an hour if you really have a hard time with it or your data model is really convoluted.