Dauphin Supple Chirp:
Yes, it takes a few seconds longer to comprehend a post with bad grammar, but I think spending hours in school perfecting one's English writing skills may not be the best use of a meditator's time.
Regarding the original question: I agree with Nikolai you should increase the length of your sessions. 45 minutes to an hour is good, especially for samatha sessions. It may throw you off balance, though, if you make the change too suddenly. What I would do is set the timer to 31 minutes, then 32, etc., until you reach 45 or 60 minutes, maybe even beyond. You can increase it a minute per day or every few days, just to make sure you don't lose your rhythm.
Thank You, That is A Helpful, And Thoughtful Answer!