The default scheduling for 1-1s is weekly. I encourage you to start with weekly 1-1s and adjust the frequency only if both of you agree that this is more than you need. Weekly means that you talk frequently enough to keep the meetings short and focused, and it gives you room for the occasional missed week. When you meet less frequently, any missed 1-1s must be rescheduled, which is usually a drag on both of you.
Try to schedule your 1-1s for times when you and your report are both likely to be in the office. Mondays and Fridays are bad days for 1-1s because people tend to sometimes take long weekends and miss these days. I prefer to do 1-1s in the morning before things get busy, in order to avoid having the schedule slip or being forced to reschedule due to other things coming up. However, morning 1-1s only work with people who also get in early and those who don’t have morning standup meetings to work around. Respect the “maker schedule” for your reports and try to give them 1-1 times that aren’t likely to be right in the middle of their productive workflow hours.