At that age it is hard to expect them to play independently for the rest of the day. You don't say whether you work outside the home or not. 1 hour on a weekday if you work outside the home is a decent amount of focused time with them. If you work in the home, 1 solid hour is not going to seem like enough to them. I have a home daycare and honestly on the weekdays I get very little done in terms of housework when the children are here--by design! My job is to engage and enrich them. Yes I have guilt about the undone chores but my husband supports me in how I care for the kids and knows how hard it is with just one of our own on the weekends, much less the 4 I usually care for. Some suggestions for you:
-Try 15-20 minutes of directed play with them (set a timer if it helps) and then say Mommy needs to do __________. Set the routine like this and be consistent. If you have a playroom, put a gate up if you don't want to be followed or fear the little one will do something unsafe. When I have little things I need to do with 4 kids in the house (ages 1-3) I gate them in the child proof playroom, run a clean up the table from meal or warm up the meal, take one or two to the potty, etc. They know the routine and they are told to respect the gate when it is up because it is there to keep them safe. One of the kids does not have those boundaries at home and runs his parents ragged and he has learned at my house this is what happens--any child, no matter how spirited can learn with consistent repetition of a reasonable routine.
-Try activities where you are doing chores nearby and can encourage, check in etc. I do not actively play pretend and do the playing for 4-6 hours a day! Good for those who can actively play for that long. Most of my involvement is through conversation about what they are doing, providing new stimuli for them and observing, not directing their play. Open ended art materials (try a diff. medium each day) like clay, playdoh, dot paint, water color, markers, colored pencil, dry erase, chalk with and without water can occupy them for 20 to 30 minutes at a time where you can load the dishwasher, sweep up , vacuum etc.
-Try writing down a routine for you and the kids if you are at home with them. Weekends are honestly harder for me because we are off our routine and my daughter needs that structure! Most kids do! If they know what to expect, they respond better. Loosely schedule meals and snacks, outside play time, "art" time, storytime, free play, Mommy play, naptime and stick to it within reason.
-My husband has no illusions about how much housework I can get done and is completely fine with it. I suggest you give your husband a taste of what it is like to actually care for 2 young children while doing all that very essential housework. Leave him with them for at least 3 or 4 hours (not during nap time) and when you return calmly discuss how it went. I think very little housework would get done ...discuss how the pressure to keep a perfect house is not far to you or the children. He should be willing to divide chores differently and take on more to keep up his level of cleanliness or he should learn to relax his standard.
Hang in there! It will take cooperation and change from all parties involved to find the right family balance:) I try to tell myself that at 15 my child won't be clamoring for my attention and that I need to relax and enjoy it.