They have a huge test matrix. Sharding tests, performance tests, and large data tests probably take a long time. You can see their test matrix here: https://mc

They have a huge test matrix. Sharding tests, performance tests, and large data tests probably take a long time. You can see their test matrix here: https://mci.10gen.com/ https://mci.10gen.com/ and the driver tests here: https://jenkins.mongodb.com/ https://jenkins.mongodb.com/ Also they run https://mms.mongodb.com/ https://mms.mongodb.com/ which does backup and monitoring