Automatically calculate mean time between list of dates while ignoring blank cells in list

I'm trying to calculate the average number of days between a list of dates, but there are blank cells in between just about every row with a date value. For example, A1=1/10/2020, A3=1/19/2020, A6=2/2/2020, and A10=2/18/2020. I could do this manually of course, but I want it to be able to passively update once new date entries are inevitably added.

Bonus Question: Next to each date entry (two columns over actually), is a value indicating number of hours elapsed from that date. How would I go about writing a formula that would incorporate those hours as well and then calculate the average length of time between the end of the previous denoted period (From Date_1 + Hours_1/24 to Date_2, and so on) and the beginning of the next one. Piggybacking on the above example, C1= 100 hours, C3=10 hours, C6=25 hours, C10=38 hours.

Any and all help is appreciated! Thank you!

The values in C are not the intervals between the dates, they are arbitrary lengths of time that begin at the timestamp defined in column A. So let's say Period 1 Begins at date/time A1 and lasts for the number of hours in C1. Then that's when the interval I'm looking at begins. That interval ends once we hit date/time A2. So on and so forth.

Attached is sample workbook