How long before my reserved time is it advisable to go?

Fui sin reserva y no espere para entrar.

There's no need

I went without a reservation and entered without delay. Everything perfect..very well organized

Half an hour earlier

Yo fui sin reserva y no tuve que esperar.la entrada es rapida

I went half an hour before because it is what was recommended in the go city pass and I entered directly if you wait. Having a reservation it is not necessary to go far in advance, there is a bit of a queue inside the entrance control but nothing to write home about, you enter quickly.

The reservation is not worth much, even if you go a little later you can also pass, there is no waiting line either

I went without a reservation and didn't have to wait.

It is not necessary to go before because only those who have the accesses enter at each specific time.