A:Answer Hi Bill- This is Sue at GE Appliances. We are excited to hear of your interest in our GE Café Series CEB1599SJSS! Heating to 425F takes an average of 12 minutes, will be no longer than 15 minutes. Heating to 350F takes and average of 8 minutes, will be no longer than 10 minutes. Also, this countertop microwave oven is built-in capable with a sleek matching trim kit: OPTIONAL 30" BUILT-IN TRIM KIT JX9153SJSS or MICROWAVE OPTIONAL 27" BUILT-IN TRIM KIT JX9152SJSS. We suggest to view the Quick Specs for details at the following link: http://products.geappliances.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=CEB1599SJSS_R2.pdf - Also, if you need a built-in model, check out our GE CAFE™ SERIES 30 IN. SINGLE WALL OVEN WITH ADVANTIUM® TECHNOLOGY CSB9120SJSS. Advantium uses power from a high intensity halogen light, ceramic heaters, and microwaves to cook food from the top, bottom, and interior simultaneously to seal in moisture and flavor. No preheating is necessary when using the Speedcook option. Check out pages 11-15 of the Owner's Manual: http://products.geappliances.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=49-40738-2.pdf - With inspired aesthetics and impressive power that mimic great restaurants, GE Café™ Series is a dream come true for people who love to live in the kitchen. Learn more about our Café Series: http://www.geappliances.com/ge/cafe.htm - Keep in touch. We are always eager to help!