Clutch master cylinder - how many hours to replace?

[trackdaychamp]

Hi there,

I got my clutch replaced in December after a traffic light race (stupid I know!) fried it. The guys who did the clutch job said that my clutch master cylinder should be replaced at the next service. Since then the same clutch symptoms as before my replacement have returned - little resistance on pedal when releasing clutch, more difficult to engage some gears (especially second). When I called the mechanic he said it must be the master clutch cylinder...

1- Does this sound like its the clutch master cylinder?
2- How long should it take for them to change it?

Thanks,

Mark