I'm having lots of conversations to sign PACTs right now (early in VC Labs), what are best practices to ensure the LPs close when it's time? (or at least up the percentage after the pact is signed)

Obviously if someone says yes to a non-binding agreement it's no sure thing of actual closing (i understand the series of yes mentality and agree it's a good strategy - so i'm in!) What are best practices to have them come through when it's time to close (to up my % of closes from PACT?) -->  What's the time frame expected or typical for LPA and capital call (to manage their expectations and get that in the conversation)? [hub reports 12-18 months - but we've discussed 6 months in vc labs so would like clarification .. i know it's not black and white though and is how fast can i close/should i close and what can we do/what do you expect of us? I'm looking to close this by the end of the year! is that realistic? well idc i'm doing it anyway we have a world to impact with good ethical investing - also looking for what i may be missing and should watch out for to hit my goal - some of the unknown unknowns!!] Thanks!