1 gigasekunda to 10⁹ sekund. 

Obliczamy, ile to 3,78432 gigasekund:  
$\underset{\text{gigasekundy}}{\underbrace{3,78432}}=3,78432\cdot {10}^9=3,78432\cdot 1000000000=\underset{\text{sekundy}}{\underbrace{3784320000}}=$  
   
$=3784320000:60=\underset{\text{minuty}}{\underbrace{63072000}}=63072000:60=\underset{\text{godziny}}{\underbrace{1051200}}=$     
$=1051200:24=\underset{\text{dni}}{\underbrace{43800}}=43800:365=\underset{\text{lata}}{\underbrace{120}}$  

Treść telegramu to:

Życzymy Ci 120 lat życia.