Krzysiek91:
but I want that interrupt sygnal must last at least one second
An interrupt is always an instantaneous thing - there is no such thing as a long interrupt.
The Arduino must be awake in order to measure time.
If you want to ignore IR interrupts for a second AND for the Arduino to sleep for most of the time while it is doing so then I think you need to set up another Timer interrupt that can wake up the Arduino briefly for N occasions during which the IR interrupt is OFF and when the Nth timer interrupt happens it turns on the IR interrupt and turns off the timer interrupt. When the following IR interrupt happens it will turn on the timer interrupts and turn off the IR interrupts.
However I wonder if what you are trying to do is worth that much trouble?
What are you trying to achieve?
...R