1) Estimated time for build is (in my observation so far) not a weighed value of say the last 10 builds, but rather heavily/only dependent on run time of last build. So if the last build failed, expected time will decrease to a very low and thereby unrealistic value. Could it rather be calculated using weighed statistics (taking different agents "base time" - due to performance differences - into account), going back into time more than now?
2) It seems agents usage statistics is not persisted into database, but only available while TC application is up and running. Restarting TC and/or server resets usage statistics completely - I'd love to have proper statistics going back for say one year.