my composition in the timeline extends beyond the visible part of the timeline and unable to fit

so the after effects timeline panel shows about 30 seconds of any composition and to render the full/ entire composition,(which is more than 30 seconds) i will have to first determine the length of the composition or fit the entire composition within the visible limits of the timeline panel to set the render frame to the exact start and stop points and then render . but this is impossible in my timeline as the panel shows only 30 secs of the comp, then when i scroll the composition to the left , i can see the remaining comp. now whn i render im only able to render 30 secs (visible part of thetimeline) and the remaining part of the composition which is hidden in the scrollable part is not getting rendered. please can someone tell me how i can fit my entire comp( start to stop) in the visible area of the timeline. 

im even unable to stretch the render frame beyond the visible part of the timetline( ie the part that gets hidden and revealed only when it is scrolled.)

im using "Add to render que" .

when i mean visible part of the timeline , it is the part that is in the panel by default 0 to 30 sec, the remaining part exists when the timeline is scrolled 

ive attached a image below to show what i mean by visible part of the timeline. 

ps: im new to after effects . any help appreciated. 🙂