Before reading this, please realise that I'm not a medical professional, and my knowledge about stimulant-binges is mostly based on my own experience and anacdotical evidence from other, fellow stimulant (ab)users.
As an experienced amphetamine abuser, I can tell you with confidence, that unless you have a heart condition or something that'd make you super-prone to cardiac arrest, you should be able to redose and just keep on going until tonight.. In terms of binging associated risks, I've always considered amphetamines quite "forgiveable"; don't get me wrong, your comedown will be worse the longer your binge lasted, but 50 hours is not an exceptionally long binge.. I mean if I were a doctor I'd probably tell you you're destroying your body and frying your brain out, but honestly, I've done a loott of 75+ hours binges, it gets real trippy around the 50 hours mark, but as long as you keep yourself well fed and make sure to lay off the stimulants for a couple weeks after this binge, or at least go way easier on it, I honestly don't believe you're doing that much damage to yourself..
Also the amps I binged on were street amphetamines, yours is pharmacutical grade, and more dextro- than levoamphetamines, which makes it less stressful on your heart and veins.. So yeah, if I managed to binge on that shit and still live to talk about it, you will definitely be fine!
TL;DR: If you feel like your body can handle it (i.e. if your heart is not beating 180 BPM already), you can easily redose and postpone your crash until tonight.
P.S. Now that I'm reviewing my post, I realised it might seem like I'm actually promoting binging.. I EXPLICITELY ADVICE AGAINST BINGING ON STIMULANTS, if done (too) frequently it WILL get the best of you.. Amphs are a man's best friend, but only if you treat it with the respect it deserves.. Your body and brain need time and good care to restore from a 2-day+ binge, seriously lay off the amphs for a couple weeks at the very least after this, and IF you use them right away again, stick to your therapeutical dosages..