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https://www.fdot.gov/designsupport/Scope/default.shtm
The Department has developed a Standard Scope of Services for procuring Project Development and Environmental (PD&E) services, Design services, and combined PD&E/Design services and guidelines for negotiating staff hours. These documents are to be used on each project and modified only with project specific information.
https://cr4.globalspec.com/thread/19575/STANDARD-MAN-HOURS-FOR-DESIGN-ENGINEERING-ACTIVITIES-PROJECTS
It's not standardized but seems look common practice to define man-hours for design engineering. What you should to do is more practice based on lesson learned as you have it. It's unique and need some self talent to define and improvement with some parameter (s).
http://www.supercivilcd.com/MAN_HOUR.htm
independent design & drawing checking: calculation of actual quantities from drawings: total man-hours: total of design + drawing man-hours: add for co-ordination/overheads etc. in % grand total of man-hours
https://homeguide.com/costs/interior-designer-cost
Interior Designer Hourly Rate. Interior designers hourly rates are typically $100 to $200, but can range from a minimum of $50 per hour for a junior designer, up to $450 an hour or more for an experienced designer or principal of the firm. The more experience interior designers have, the more they will charge per hour.
http://www.nwlink.com/~donclark/hrd/costs.html
It takes them between 40 to 80 hours and costs $15,000 to $30,000 to develop one hour of elearning (George, Mcgee, 2003). This includes the instructional designer, project manager, and outsourcing fees (the instructional designer takes the content that is written in instructional design format to three other companies and an in-house group for bids).
https://blog.psprint.com/designing/are-you-charging-enough-average-graphic-design-pricing-list-2019/
Still, you can get a general idea for how much average designers make for common projects with the following graphic design pricing list, based on a rough number of hours per project billed at a$25, $45 and $150 per hour. Logo design (approximately 15 hours) Low end: $375; Mid-range: $675; High-end: $2,250; Tri-fold brochure (approximately 6 hours)
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