Here is a thread on estimating studies that might be helpful, there are couple links buried within:
viewtopic.php?f=2&t=702As far as
just building the model goes, I count the number of panels, transformers, motors, switchboards, switchgear, disconnects, UPS's, ATS's, Generators etc. on the one-line to get a quantity of busses and add a little for estimated node busses. 8 hours per 100 busses. I can usually beat that time if I'm working with good information. Sometimes significantly but sometimes not. If I have all the submittals from the project I might add a little more time as I will be entering all the breaker make and model data while building the model. When I build the initial model, I use "Incomplete" for the Data State field and a blue/gray color with the data state status toggled on.
I add another 8 hours per 100 busses to enter and/or check off all the data collected vs. the model, or maybe a little less time if I have the submittals as I will have already entered the breaker manufacturer and model data assumed to be mostly accurate. I change the data state from "Incomplete" to either "Verified" or "Complete" as go go to keep track of my progress. Verified is I know 100% for sure. Complete is not verified but the best I can do (couldn't read the printing on the cable or feeder is underground so I estimated the length or SCCR rating unknown etc.)
So, I'm looking at about 16 hours per 100 busses to build the model initially then to enter or confirm all the wire sizes and lengths, breaker data, motor HP, continuous and AIC or SCCR or WCR ratings etc. after data collection has been completed.
I don't have a rule of thumb for data collection. I estimate that on a per job basis depending on the data I have ahead of time. Sometimes you already have a model from a previous study and few or no changes have reportedly been done since the last study, sometimes you pretty much have nothing. No drawings at all to start with. That is hard to estimate. Lately I've been trying to get others to do the data collection for me as I am winding down.
Coordination study, and determining recommended settings if necessary - usually also about 8 hours per 100 busses, although I can usually get that done much faster, it is just what I budget.
SC study, Equipment Eval, looking for series ratings or other recommendations based on findings about 4 hours per 100 busses
Arc Flash Study, setting up the label if customer specific (some customers don't care, some what specifics), recommendations to reduce energy and what might be sacrificed (coordination) in doing so - 2 to 4 hours
Report - about 4 hours per 100 busses although I might budget and price 8 hours depending on the job.
These are not all hard and fast rules. They are my starting points that may be adjusted up or down depending on the quantity and quality of information available.
100 buss study for an existing building with a mostly good one-line ahead of time -
Build the initial model for data collection using my "Data Collection" data block - 8 hours
Data collection (2 people, 1 to 2 days) - 16 - 32 hours
Update the model with collected data - 8 hours
Coordination study w/ existing and recommended settings - 8 hours (hope to get done in less)
Short circuit, equipment eval - 4 hours
Arc Flash Study - 2 to 4 hours
Report - 8 hours (hope to get it done in 4)
Total about 72 hours is what I would estimate for a 100 bus project that I had a mostly good one-line to start with and hope that I would beat those hours. Sometimes I can destroy that time if all goes well, my starting info is good and I'm working with someone experienced for data collection that is a worker. Sometimes, that may barely be enough hours, especially for data collection. Hopefully I would recognize the data collection is going to be tough and I would have put more time in on that to begin with.
