I asked the professor from my past university to write me a letter of recommendation five days ago, but I got no response yet. I know that 5 days is like nothing, he might be busy or on the holidays, but I am worried he doesn't want to write me the LOR and he is just silent for that fact.
I had one class with him for one semester, because I was finishing the university and he was there first year. I wasn't "super active" during his class, but still I was active and communicative. We also talked outside the class several times and he also had to write the opponent review for my MA thesis, so he should know my thinking etc. well. The thing is we haven't been in contact for almost three years and I asked him about LOR out of nowhere, explaining him my situation. I expressed the understanding that I know he is busy and I apologized for writing him during holiday season etc. I wrote him that his class helped me a lot and for this fact he came to my mind while I was thinking who to ask for LOR.
Do you think I should wait next few days and then write him again, or is it better to try to "catch him" during his office hours? In case he decided to don't write me the LOR, would he tell me or he simply won't reply?