Use realistic estimates

From tests I did with Tails 3.14 and bc022ef7. See #16805.

wiki/src/install/inc/steps/restart_first_time.inline.mdwn

@@ -63,7 +63,7 @@ the rest of the instructions afterwards, we recommend you either:
 
 <h2 id="greeter">Tails Greeter</h2>
 
-1. After 30&ndash;60 seconds, another screen called <span class="application">Tails Greeter</span> appears.
+1. One to two minutes after the <span class="application">Boot Loader Menu</span>, another screen called <span class="application">Tails Greeter</span> appears.
 
    <div class="note">
    <p>If the computer display the error message