Take 1.5 months off work to study full-time, or spread it out over several months? Targeting 675+

I work Monday to Saturday, so my weekday study time is limited. I’m targeting 675+ on the GMAT Focus Edition for an MBA application. I’m currently on the lower end score-wise and studying with TTP.

I’m weighing two approaches:

**1.**	Take around 1.5 months of leave from work and study full-time in one focused stretch.  
**2.**	Keep working and spread the preparation out — roughly 30 to 60 minutes on weekdays, with longer sessions on weekends over a longer period.

For those who have tried either approach (especially working professionals): which one actually worked better for a significant score improvement? My concern with the second option is that 30 to 60 minutes on weekdays may not be enough to build momentum, and I’ll end up re-learning material. My concern with the first option is burnout from 1.5 months of continuous study, along with no buffer if I need a retake.

I’d really appreciate hearing what worked for you and roughly what improvement you saw. Thank you!