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Hello and welcome to just answer.
The timing belt should take about 2 and a half hours to do so it would depend on where you are thinking about taking your car. A main dealer would be charging you more than £100 per hour plus VAT. You could find a local independant garage and again these labour rates vary around the country between around £35 to £80 an hour plus VAT.
The cambelt kit itself would be around £50 to £100 depnding on if you go for a genuine kit or an after market kit.
I hope this helps and if I can help further please feel free to ask