After about the tenth purchase of the soul of a Project Lawful girl from a Count of Hell delighted to be getting one over on her by selling at the last list price, or else suspicious that they're being cheated, or both at once, Carissa can feel herself flagging. 

It's been a long ....day? Probably just the one day. She's not actually sure how long she spent in Dispater's presence, going over the contract. Her Unseen Servants last almost nine hours at this point, and they ran out at some point. The Most High hasn't recast Planar Adaptation, which means it hasn't been more than twenty hours, unless time is obeying Dispater, here, which it probably does do.

But it's been long enough that she's run through all her adrenaline and is persisting on sheer determination, and inconveniently she still cannot afford to make a mistake. 

When she's a devil she won't need to sleep and won't get tired it'll be amazing.

After about the sixth purchase of the soul of a Project Lawful girl from a Count of Hell delighted to be getting one over on her by selling at the last list price, or else suspicious that they're being cheated, or both at once, Carissa can feel herself flagging. 

It's been a long ....day? Probably just the one day. She's not actually sure how long she spent in Dispater's presence, going over the contract. Her Unseen Servants last almost nine hours at this point, and they ran out at some point. The Most High hasn't recast Planar Adaptation, which means it hasn't been more than twenty hours, unless time is obeying Dispater, here, which it probably does do.

But it's been long enough that she's run through all her adrenaline and is persisting on sheer determination, and inconveniently she still cannot afford to make a mistake. 

When she's a devil she won't need to sleep and won't get tired it'll be amazing.