I got in this year - but I'm hoping I've got enough time to train - I did 3 centuries last year, along with 2 60 milers with 6000+ of climbing, and bike commute 2X a week (43 mi RT), along with a longer ride on the weekends....

Here's the plan so far - I'll be bike commuting 2-3X a week, with one long ride on the weekends.

March long ride
30 miles yesterday
50 next week
60 last week.

April -
80 long ride
first 100 miler (relatively flat - 3500 feet overall)
50 miler
60 miler (5000 feet)

May
2nd 100 miler
50 miles (6000 feet)
3rd 100 miler
Taper to June 6th ride

Plan for Mitchell is to survive. Anything else is a bonus.