I did exactly what you are planning to do, except I didn't remove the second floor myself. If you are intent on saving funds, get a quote for the cost of demolition separate from the construction. Don't forget that cost includes debris removal, so you won't eliminate it completely.
Based on my experience, the demolition should only take about two to three days, depending on the size of the crew doing the work. Based on the amount of time it will take to rebuild the floor, project that to be about 5-10% of the time to do the whole job.
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