The first few times. It eventually comes a lot easier than that. The longer you use it, the more it feels like it's at your fingertips.

[Alice looks around, making sure they're still safe, and sips at her drink.]

It drains you the first few times. It's both a shock to the physical system and to you mentally. Take a rest for now. You'll need to summon again eventually tonight, but I won't push you harder than you need.