FERTILE CM QUESTION

I just used the bathroom and when i wiped I always tend to see what's on the tissue. Well there was a whole lot of fertile cm, well my question is how long do you have to bd? Do you have to bd as soon as possible? Within the nxt few mins/hrs? or before the day is over with? My spouse is currently working on the other side of town a few hrs away and wont be home til later. Do this mean I'm going to miss my chance?