When to Join the new employer after I797 Transfer

My H1B got transferred to new employer and I got the I797 hard copy too,
My question is
Do I have to join the new employer immediately or can I join after two months? My new employer has a scheduled onboarding process so they gave two options one is immediate and another one is after 60 days. I cant join immediately so can I join after days?

You should be able to join anytime that you desire.

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