Dry hopping the lager

Hi!

I would like to know what was the best method you have used to get the hoppy aromas in to your lagers.

What was the amounts / times you used to dry hop ? Is it better to change the hop sacks once or twice or just let it lay for longer time. Week before bottling or earlier ?

Not really that much different than an ale. Not sure why you would “change hop sacks” assuming you mean dry hopping that sounds like an oxidation nightmare.