It's possible to build a simple connector very quickly! We have
where we build a source connector with the Python CDK in under 30 minutes
octavia rocket
A database connector would be more complex than this, but we do our best to make it as painless as possible. It's hard to say exactly how long it takes since each connector has a unique problem to solve, but here are some docs to can give you an idea:
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Python CDK - helps you build JDBC sources and destinations
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Building a Java destination
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source-postgres code - a JDBC source connector that may be helpful to base your connector on