Judge it yourself.
If some speed control is applied 80nm from touchdown, then it's probably ok to deccelerate normally. There are so many factors to your ground speed, that it's impossible for the controller to judge your arrival time precisely at this stage anyway. But please - comply to the restriction. Many units can see your IAS with mod S downlink, so we are usually perfectly aware of your actual speed.
If you are vectored for final approach in a busy airspace and told to reduce/keep the speed, then act immediately, because a prompt reaction is usually required to achieve proper spacing on final, to make a gap for a departure or to maintain separation. You will complicate controller's work if you do not slow down quickly or, which is sometimes even more disturbing - unexpectedly slow down on your own. This is usually a chain reaction - some other aircraft will have to slow down more than it was planned, or fly some extra miles because of you.
And - if you are unable to comply with any speed control, say it loud! ATC will implement an alternative solution to the situation, but we must be aware, that you will not act as you were instructed!
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