Development Time and Roast-Level Metrics

Development time, total roast time, mass loss, and roast meter readings are often discussed together when comparing ROEST profiles. Community examples suggest these values can be useful reference points, but they should not be treated as universal targets because similar development times can occur with very different inlet temperatures and overall roast lengths. One roaster reported having the same development time across two roasts despite “wildly different inlet temps and roast lengths.” source

Community-Reported Development Time Examples

One reported pair of roasts had a development time of 0:48 on both roasts, with development time percentage described as roughly 8–9%. The same roaster described the total roast length as about 8:30–9:00. Treat these as example values from a specific profile context rather than recommended targets. source

Another community member reported being around 9.5% development time, with 44 seconds of development and a total roast time of 7:06. They noted that the other roaster’s roast was longer than theirs. This illustrates that similar development percentages or seconds can sit within noticeably different total roast times. source

Community-Reported Roast Level References

One community member reported a mass reduction of about 12.6% during the roast. They also reported a roast meter reading around 108–110 and said that many coffees they enjoy are closer to the 115–120 roast meter range, which they wanted to target for a similar roast level. Treat these as personal preference and measurement-context references, not general roast-level standards. source