My dtv also got approved. I went for Muay Thai visa

I am British and have a 12 month Ed visa are there any restrictions on how long I can leave the country for? ie if I need to travel to the UK, for instance, can I go for 30 days? My extension thingy I have to do is in May so would plan to be back before then.

I'm currently here on an ED visa in Bangkok but purchased tickets a while back to return to the US over the upcoming holidays. I'll be gone dec 7 returning jan 4. Is this too long? be a problem? I haven't seen any info on maximum length of time allowed out of the country etc.. I'll be going to chaengwattana this Tuesday to apply/pay for a re-entry stamp. Thanks very much for any help!