Better ti change BP in such circumstance!!
Also number of station depends on train stop (as if train do hav next stop after 100-200 kms, its irrelevant)!!
If the boarding station is a point where staff change happens & instantly train get checked, thn it mayb instant issue!!
Normally, within 1 hour span, different station board dnt remain issue..bt all are subject to demand,...
more... train check & RAC clearance..as by rule, u cant blame TTE!!