The PnL between $t$ and $T$ is definitely the sum of all incrementals PnLs. That is certainly if we denote by $PnL_ uto v $ the PnL involving times $u$ and $v$, then How do I mitigate fallout of enterprise downtime owing wrongfully used security patch because of inconsistent terminology https://www.youtube.com/watch?v=qMmsQ4kKgY4