The boss admits it's an exhausting time for all the Barclays Premier League clubs but acknowledges the schedule was even more arduous in the past when games on consecutive days was commonplace.
United follow up Sunday's assignment at QPR and Wednesday's trip to Fulham with a Boxing Day encounter with Wigan.
"It's always been that way but it's not as severe as normal," he stated. "One December had 10 games in it and there are not as many this year. It's the same for everyone and there's nothing you can do about it.
"If you go back many years, it was remarkable, playing one day and then the next. I remember Burnley beating United 6-1 and, a couple of days later, United won 5-1 at Old Trafford! As stupid as football was then, it was probably really exciting!
"The intensity of games has increased and the pitches are better, although I expect them to be softer and heavier in December, depending on the
26/12/63 - Burnley 6 United 1, Turf Moor
28/12/63 - United 5 Burnley 1, Old Trafford
Other tough 1960s assignments:
26/12/66 - Sheff Utd 2 United 1, Bramall Lane
27/12/66 - United 2 Sheff U 0, Old Trafford
26/12/69 - United 0 Wolves 0, Old Trafford
27/12/69 - Sunderland 1 United 1, Roker Park