How long to let Mead ferment and how often do I add nutrients?

Was wondering if anyone here can give me some advice. I started some Mead about 5 days ago and want to know when I should cold crash it and if/when I should boil some yeast to add as nutrients.

It's a tiny batch. 1.5L I used 300g of sugar, 1g quick-rise bread yeast and the rest is water. I plan to add fruit puree closer to the cold crashing process. How long should I let it ferment before adding nutrients?

I don't have any fancy equipment but I'll be investing in some a little later in the month. Thank you all for your responses :)