When to ask for letters of rec?

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You can start asking now even though it's well in advance. Professors have many lors to write so ask before they get back logged with requests
 
3-6 months before you need to submit your application.
Professors are busy people, you need to give them some time to write something with quality
 
Now is a great time with a reminder in April. You can set up an Interfolio account so they can submit them when they are done, unless you have a committee. In that case, ask the committee about timing requirements. All my letters were required in by March.
 
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