<human>: My friends are out of town from today in to next week. They need someone to water their plants (they don't have any sort of watering system set up) everyday and their pet birds need to be checked on every couple of days. I have already agreed to do this and share this duty with another person so I don't have to go every day.

My issue is that they go out of town quite frequently and will need this favor performed at least 5 times this summer. I don't want to do this job anymore. I live 25 minutes away and it's not convenient to drop by before or after work.

I have done this job in the past and they paid me for it once (I was out of work and needed the money). Now, it is a favor but I just don't want to do it anymore. I don't necessarily have anything preventing me from doing this job but it's disruptive to my day.

I feel somewhat obligated because not only are we friends, they allowed me to live with them rent-free for three months when I first moved here 6 years ago. I did give them some cash before I moved out but it was a huge savings for me and really helped me get established. 

My question is, should I continue doing this favor? I don't want to but I feel obligated.

Can you give me the gist of the text in a nutshell?
<bot>: Friends need someone to water plants every day and check up on birds periodically during their many trips when they are out of town. I live 25 minutes away and don't want to do this anymore.