Depending on the speed of your computer, the complexity of you project (eg effects and transitions) and the quality settings of your output, you must expect and accept waiting for renders to complete.
As an extreme example using MEP17+, I just applied NewBlue free cartooner effect to a 10 second clip and exported as 1920 x 1080 best quality MPEG-2 video on a 2.4GHz Core 2 Quad machine. Render time was ~20 minutes! No wonder Magix includes an option to 'Shut down PC after successful export' for users doing their renders overnight. On the other hand if your source material matches your export format you can tick 'Smart render' and unedited sections are simply copied.
Workflow suggestions: Check small sections, eg a transition, by setting export for selected section only. When satisfied then render your full film. If you don't have a blank disc in your burner you can stop when the program asks for one and check the 'disc image' in your PC DVD player. Or simply choose 'Image recorder' as your DVD burner. When satisfied then burn to disc -- many users use free 'Imgburn' for that step: http://www.imgburn.com/.
Rendering time depends your computer power, the number of effets plus movie length in function of output quality. For a presentation I suggest 12 to 15 minutes movie length containing just the essential and the best shot, music, title and few effets only a WOW type or that I call TV type. Rendering time is about 20 minutes. For a birthday, family holiday a maximum of 30 minutes movie length containing the best shot, music, title and few effets if the project is 30 minutes think to add an animation like we found in Catooh normaly this requires up to 50 minutes rendering time.
All projects 30 minutes or less can be burn on regular DVD but with the HD quality and you need absolutly a Blu-Ray player. My philosophy behind this I prefer less time only the best shot and a story (scenario) to tell. If you need a movie for 1 and sometime 1,5 hour you have to wait 2 or 3 hours or overnight to view the result.
Why DVD versus Blu-Ray? The cost is about $0,50 versus $2,50 but for me I can print directly on DVD this is now regular stock in store but nobody offer similar Blu-Ray to print on.