My experience is it should always be evenly distributed at such an early stage (3 months is still considered early). I've started two companies and it has never

My experience is it should always be evenly distributed at such an early stage (3 months is still considered early). I've started two companies and it has never failed me. This eliminates any drama and holds each founder accountable for the work that is required. If you don't trust this approach, then there are deep underlying issues that need to be addressed first. This could be not trusting the incoming founder to make up for the time that has passed while you were running the company initially.