You can enroll in the waitlist for a particular group date until 1 month in advance. For example: A trek starting on 30th July, 2018 will be open for waitlist registrations till 30th June, 2018.
The final status (confirm/declined) of your waitlist registration is sent via email, 15 days before the designated trek start date.
So, if you have enrolled in the Waitlist phase on 30th June for a trek that starts on 31st July, then you will be informed of the final status by 16th July.
These 15 days after the confirmation will help you organize your trek plan effectively.
It’s important to know that enrolling in the waitlist doesn’t assure you a confirmed seat. It’s still better to look for alternate dates first and plan your trek accordingly.