Motherhood guilt!

Hi lovely's

I am a single mother to a beautiful 2 year old and I am about to return to work! My son is in my care 24/7 and see's his "father" when he decides to make the effort. I have had my son in daycare 2 days a week for about 6 weeks now so that we can both get used to it, but now that I am returning to work it will be 3-4 days a week and eventually back full time. I work 45 mins away and lucky enough to have my parents close by to help out but I am worried that I won't be able to spend enough time with him. The daycare drop off will be at 8am and my parents will pick him up around 4, and I wouldn't be home until 6-6:30, leaving around an hour-1.5 to spend with him before he goes to sleep. I am becoming rather anxious at the thought of losing our wonderful bond and I am so unsure of how to maintain it and deal with the guilt! I know we will still have weekends together but I really worry that it won't be enough :(