Depends upon many factors, not the least of which includes what life safety code was locally adopted.
For example, under NFPA 101 (2009) Life Safety Code, you would divide the net square footage by 15 square feet per person to obtain the area limit (433 people). Then you would calculate the egress load limit by allowing 0.2 inches per person. For instance, you would need at least 87 inches of egress openings (at least three doors 36 inches wide) to accommodate 433 people.
However, if there is live entertainment, the front doors alone would need to support exit of 2/3 of the max load, i.e., 289 people, which would require at least two 36-inch doors (out-swinging, panic hardware, etc), among other factors.
Your local fire protection engineer and fire marshal will do the calculations for your particular situation, based upon the local code.
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6500 sq feet = 604 sq metres (approx).
Assuming the house is square - yes.
That depends on the length of your pace (step). My pace length is 2.5 feet, so I would make 2,600 steps to travel 6,500 feet.
Depends upon what kind of assembly it is. There are dozens of different load factors to select from, not including exit load factors. For instance, a dance hall of that size might accommodate 370 people (factor of 7 square feet per person), but only if the main entrance also provides for emergency exit of 245 of those people (2/3), meaning it would need to have 2 doors that were both 3 feet wide. There are many other factors, depending upon type of assembly, what floor it's on, etc.
How to dis-assemble the case