What is the rough spread+slippage of a normal broker?

I'm planning to get into forex and have been doing some backtracking and calculations.

I see that the current spreads for GBPUSD and EURUSD are 3pips and 2pips, respectively.

What is a good a rough average of the slippage that occurs? How wildly does slippage and spread fluctuate depending on the market situation? What's the worst case scenario? Is there a data table out there that lists average slippage and spread fluctuation by week or month?

Give me answers in numbers if you can please. Thanks.
 
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