Are there any drawbacks to working 4 days?

[wormybookworm]

I'm about to ask my employer to rearrange my working hours so I do 4 longer days rather than 5 slightly shorter ones.

Are there any drawbacks to doing 4 days a week? My current worry is missing out on projects because I'm not there and visible all the time...

On the flip side, I'm really looking forward to an extra day to myself for life admin, seeing retired family more, and whatever else!

This doesn’t apply if you work full time compressed hours but I’m just facing the downside of slightly reduced hours, a reduced pension. I knew I was earning a bit less at the time but hadn’t really calculated the cost of less pension over potentially many years
This is something that none of my male colleagues are grappling with because none of them reduced their hours.

I don't work Mondays and my workplace doesn't operate on Bank holidays. Doesn't mean I lose my day off, I just take it at a different time! Not hard to organise at all.

I get loads of personal work/banking/tax/medical stuff..(long list) on a Monday because its the start of the week and I have more energy to get through my personal list than on a Friday.

(Also we have shorter working Fridays in summer so why lose that?!)