My laptop is cranking through but my desktop is on its last legs really, the reason why it is on 24/7 is because if i turn it off i'm worried it wont be able to turn back on again and i need it to print stuff out etc.
If your desktop is that old and you are worried about it then it may be best not to run F@H on it.
As for running F@H on your laptop any contributions are appreciated, and folding need not involve any changes to how you already use your system. If you want to only fold while your system would normally be on and running anyway, that's fine. There are contributors like
Sophie_378 that complete and submit about one WU per month. That appears to me like she runs her folding client part-time. One WU per month may not seem like much, but she has been active on the team for over four years now, so it adds up.
The next step up would be to leave your laptop plugged in and running during the night, or all the time. Disable any power options to automatically suspend or hibernate and turn off the screensaver.
The F@H client has an option to be set to run as a service, meaning it automatically starts whenever your computer is turned on. If you combine that with the configuration option to pause folding when on battery power, and then leave your laptop plugged in and running, your F@H contribution will be hassle-free, not hinder the mobility of your system, and produce the maximum results.
I've seen somewhere that WU for this beta client has much shorter deadlines. Do you have any info on this? How can I tell that my results have been rejected becouse of the deadline?
Yes, the beta clients like SMP have much shorter deadlines. The current projects are listed on the Project Summary page
here. The v6.29 client usually gets the "GRO-A3" WUs, currently projects 6011-6025.
As for your results being rejected there are two deadlines, preferred and final. If you don't make the preferred deadline then Stanford puts your WU back in the rotation and sends it out for someone else to do. This is due to the sequential nature of the research where older results determine the direction of newer projects.
If you finish before the final deadline Stanford still accepts your results and credits you points, but in order to avoid duplicating work the recommendation is if you can't consistently make the preferred deadlines then the regular clients may be a better choice than the high-performance beta ones.
Currently most A3 WUs have a 3 day preferred and 6 day final deadline. As long as your computer is finishing the WUs in less than 3 days then all is well.