There are a number of Bible Reading Plans which range from 61-365 days. Try out a short one or go for the gusto with a large one.
I would recommend the chronological plan if you want to get a feel for how things happened in what order in the Bible. If you want a general knowledge builder, try the survey plan. If you are interested in people's experiences with God, try the biographical plan and even pick and choose which people you find interesting.
Don't let the plan use you. You use it. Start anytime. Finish anytime.
Chronological Bible Reading Plan (61 Days)
Survey Bible Reading Plan (61 Days)
Biographical Bible Reading Plan (121 Days)
Comprehensive Bible Reading Plan (365 Days)