99 LP
This has been an annoyance for most people in ranked and is a very frustrating experience. A simple solution to the problem is that however many LP you gain, it roll's over if you are successful in your series.
For example, I have 99 lP and win 23 LP, but since you only need 1 LP, you go straight to your series. If you pass your series, instead of starting with 0 LP, have 22 lP from your normal ranked win rollover (or convert it since a bronze 4 win isn't = to a bronze 5 win i suppose) so that one 40 minute game won't be worth 1 LP.
I don't know if the same logic will be applicable if you lose a series
I hope yall see where I'm getting at, thx for reading.