Just wanted to share this for anyone new to the game because I have seen a lot of new people run from the bomb during the second tick or something cause they thought they had no time.

Spike Detonation - 45 seconds since bomb plant

Spike Defusal - 7 seconds

First tick is 25 seconds, meaning this is the time to rotate/decide to go for it or save/gather info and start making your move

Second tick is 10 seconds, meaning you should start picking up your pace if you have committed to the retake and probably start defusing (try to get it half way, etc)

Third tick is 5 seconds, meaning you HAVE to start defusing or else you won't have enough time

4th tick is 5 seconds, meaning you will have no time to defuse if you aren't already defusing during the 3rd tick

The bomb takes 7 seconds to defuse.

I hope this helps anyone who is new to the game/didn't know these facts. See ya around!